title: Highcharts: Exporting.js add two extra button
body: <p>I added exporting.js to my project, but when I checked the page it seems to add two extra buttons, but in my jsfiddle it does not, do you have any idea of what is causing this? </p>
  
  <p>This is a diagram of my chart, can you see there are two buttons: </p>
  
  <p><img src="https://i.stack.imgur.com/vK8BG.png" alt="enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/CzzmC.png" alt="enter image description here"></p>
  
  <p>This is my jsfiddle:
  <a href="http://jsfiddle.net/pLDeq/10/" rel="nofollow noreferrer">http://jsfiddle.net/pLDeq/10/</a></p>
  
  <pre><code>exporting: {
              enabled: true,
              exportButton: {
                  enabled: true
              },
              buttons: 
              {
                  customButton:
                  {
                      //x: 20,
                       symbol: 'url(http://cdn1.iconfinder.com/data/icons/fatcow/16/chart_bar.png)',
                      onclick: function() {
                          setChartColumn([name,name2], categories, [data,data2], ['column','column']); 
                      }
                  }
      }
  </code></pre>