title: Highcharts click events not firing when displaying multiple line series
body: <p>When I render a line chart with multiple series, the series that has the highest y value for a given data point will trigger the onclick event every time. Every other series will sometimes trigger it, and sometimes not. I can't seem to find any pattern. If I hide a series, the new highest y value will start to work, even if it didn't before. </p>
  
  <p>I'm currently using v6.0.1 of highcharts, but I've recreated the problem in the latest version as well. It also happens on Chrome, Firefox, and IE. </p>
  
  <p>I found a thread on here about click events not firing when showing multiple series, but that was specifically about two series having identical values so that the data points are stacked on top of each other. </p>
  
  <p>I created a jsfiddle to demonstrate the problem. <a href="https://jsfiddle.net/2opdhxb6/1/" rel="nofollow noreferrer">https://jsfiddle.net/2opdhxb6/1/</a>.</p>
  
  <pre><code>Highcharts.chart('container', {
     "chart":{
        "height":400,
        "type":"areaspline"
     },
     "colors":[
        "#86bbd8",
        "#5e2e94",
        "#c83258",
        "#ffb400",
        "#7bcdba",
        "#ff8300",
        "#4464ad",
        "#e1cba4",
        "#ff9bb8",
        "#808285",
        "#da3ab3",
        "#6ecdb2",
        "#e2cc00",
        "#d8635d",
        "#3b5cad",
        "#9778d3",
        "#00bfd6",
        "#5b2c3f",
        "#4c8b2b",
        "#d9a460"
     ],
     "credits":{
        "enabled":false
     },
     "legend":{
        "borderWidth":"0",
        "symbolRadius":3
     },
     "plotOptions":{
        "series":{
           "cursor":"pointer",
           "fillOpacity":0,
           "lineWidth":2,
           "marker":{
              "enabled":false,
              "lineWidth":1,
              "radius":3,
              "symbol":"circle"
           },
           "point":{
              "events":{
                 "click":function () {
                          alert('Category: ' + this.category + ', value: ' + this.y);
                      }
              }
           },
           "turboThreshold":50000
        },
        "spline":{
           "lineWidth":2,
           "marker":{
              "enabled":true,
              "lineWidth":1,
              "radius":3,
              "symbol":"circle"
           },
           "turboThreshold":50000
        }
     },
     "series":[
        {
           "data":[
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Blog",
                 "Type":"SubMedia",
                 "Value":"BL",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":0
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Blog",
                 "Type":"SubMedia",
                 "Value":"BL",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":1182
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Blog",
                 "Type":"SubMedia",
                 "Value":"BL",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":1034
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Blog",
                 "Type":"SubMedia",
                 "Value":"BL",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":2164
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Blog",
                 "Type":"SubMedia",
                 "Value":"BL",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":1870
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Blog",
                 "Type":"SubMedia",
                 "Value":"BL",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":1324
              }
           ],
           "name":"Blog"
        },
        {
           "data":[
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Forum",
                 "Type":"SubMedia",
                 "Value":"FO",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":0
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Forum",
                 "Type":"SubMedia",
                 "Value":"FO",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":225
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Forum",
                 "Type":"SubMedia",
                 "Value":"FO",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":239
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Forum",
                 "Type":"SubMedia",
                 "Value":"FO",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":299
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Forum",
                 "Type":"SubMedia",
                 "Value":"FO",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":332
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Forum",
                 "Type":"SubMedia",
                 "Value":"FO",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":181
              }
           ],
           "name":"Forum"
        },
        {
           "data":[
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Online News",
                 "Type":"SubMedia",
                 "Value":"NM",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":0
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Online News",
                 "Type":"SubMedia",
                 "Value":"NM",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":4789
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Online News",
                 "Type":"SubMedia",
                 "Value":"NM",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":8495
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Online News",
                 "Type":"SubMedia",
                 "Value":"NM",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":10207
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Online News",
                 "Type":"SubMedia",
                 "Value":"NM",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":5324
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Online News",
                 "Type":"SubMedia",
                 "Value":"NM",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":3383
              }
           ],
           "name":"Online News"
        },
        {
           "data":[
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Print Media",
                 "Type":"SubMedia",
                 "Value":"PR",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":0
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Print Media",
                 "Type":"SubMedia",
                 "Value":"PR",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":542
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Print Media",
                 "Type":"SubMedia",
                 "Value":"PR",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":390
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Print Media",
                 "Type":"SubMedia",
                 "Value":"PR",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":729
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Print Media",
                 "Type":"SubMedia",
                 "Value":"PR",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":713
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Print Media",
                 "Type":"SubMedia",
                 "Value":"PR",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":390
              }
           ],
           "name":"Print Media"
        },
        {
           "data":[
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Social Media",
                 "Type":"SubMedia",
                 "Value":"SM",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":0
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Social Media",
                 "Type":"SubMedia",
                 "Value":"SM",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":113
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Social Media",
                 "Type":"SubMedia",
                 "Value":"SM",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":94
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Social Media",
                 "Type":"SubMedia",
                 "Value":"SM",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":79
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Social Media",
                 "Type":"SubMedia",
                 "Value":"SM",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":99
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Social Media",
                 "Type":"SubMedia",
                 "Value":"SM",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":33
              }
           ],
           "name":"Social Media"
        },
        {
           "data":[
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Radio",
                 "Type":"SubMedia",
                 "Value":"TM",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":0
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Radio",
                 "Type":"SubMedia",
                 "Value":"TM",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":323
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Radio",
                 "Type":"SubMedia",
                 "Value":"TM",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":228
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Radio",
                 "Type":"SubMedia",
                 "Value":"TM",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":359
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Radio",
                 "Type":"SubMedia",
                 "Value":"TM",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":319
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"Radio",
                 "Type":"SubMedia",
                 "Value":"TM",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":180
              }
           ],
           "name":"Radio"
        },
        {
           "data":[
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"TV",
                 "Type":"SubMedia",
                 "Value":"TV",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":0
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"TV",
                 "Type":"SubMedia",
                 "Value":"TV",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":13247
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"TV",
                 "Type":"SubMedia",
                 "Value":"TV",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":14163
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"TV",
                 "Type":"SubMedia",
                 "Value":"TV",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":12370
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"TV",
                 "Type":"SubMedia",
                 "Value":"TV",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":14956
              },
              {
                 "Date":null,
                 "Medium":null,
                 "MediumName":null,
                 "SearchName":null,
                 "SearchTerm":"TV",
                 "Type":"SubMedia",
                 "Value":"TV",
                 "marker":{
                    "enabled":false,
                    "lineWidth":1,
                    "radius":3,
                    "symbol":"circle"
                 },
                 "name":null,
                 "y":6382
              }
           ],
           "name":"TV"
        }
     ],
     "subtitle":{
        "style":{
           "color":"#c4c4c4",
           "fontFamily":"Avenir",
           "fontSize":"12px",
           "fontWeight":null,
           "minWidth":null,
           "textAlign":null,
           "width":null
        },
        "text":"(By Medium)"
     },
     "title":{
        "style":{
           "color":null,
           "fontFamily":"Avenir",
           "fontSize":"20px",
           "fontWeight":"bold",
           "minWidth":null,
           "textAlign":null,
           "width":null
        },
        "text":"Hits"
     },
     "tooltip":{
        "valueSuffix":""
     },
     "xAxis":{
        "categories":[
           "4\/12\/2019",
           "4\/13\/2019",
           "4\/14\/2019",
           "4\/15\/2019",
           "4\/16\/2019",
           "4\/17\/2019"
        ],
        "dateTimeLabelFormats":null,
        "gridLineColor":null,
        "gridLineDashStyle":null,
        "gridLineWidth":null,
        "labels":{
           "enabled":true,
           "formatter":null,
           "rotation":0,
           "staggerLines":0,
           "style":{
              "color":null,
              "fontFamily":"Avenir",
              "fontSize":null,
              "fontWeight":null,
              "minWidth":null,
              "textAlign":null,
              "width":null
           },
           "useHTML":false
        },
        "minorGridLineWidth":null,
        "minorTickInterval":null,
        "plotBands":null,
        "tickInterval":0,
        "tickWidth":2,
        "tickmarkPlacement":"off",
        "title":null,
        "type":null
     },
     "yAxis":[
        {
           "allowDecimals":true,
           "minRange":0.1,
           "title":{
              "margin":10,
              "rotation":270,
              "style":{
                 "color":null,
                 "fontFamily":"Avenir",
                 "fontSize":null,
                 "fontWeight":null,
                 "minWidth":null,
                 "textAlign":null,
                 "width":null
              },
              "text":null
           }
        }
     ]
  });
  </code></pre>
  
  <p>It's using the actual JSON that I'm rendering in my application, because when I tried sample data I couldn't recreate the issue. I figure I have to have something configured incorrectly, but I have no idea what it could be. </p>
  
  <p>In the example, you can see that all of the data points for the TV series fire the event, but nothing else does. If you hide the TV series, all of the other series except Blog start working. Any help figuring this out would be greatly appreciated.</p>