title: ScrollMagic on Enter not working properly
body: <p>I'm using ScrollMagic, the following code:</p>
  
  <pre><code>var scene = new ScrollMagic.Scene({
      triggerElement: slides[i]
          })
      .setPin(slides[i])
      .addIndicators()
      .addTo(controller)
      .triggerHook(0.10)
      .on('enter', function(e){
          panel = $(e.target.triggerElement()).prop('id');
          $('.circle').removeClass('active');
          $('.circle.c-'+panel).addClass('active');
      });
  </code></pre>
  
  <p>The on enter function works perfectly when scrolling down but not when scrolling up.
  Accordying the official documentation it works both ways, what may I be doing wrong?</p>