When for example Y axis’s limits are specified and some series are cropped (not drawn), clicking a point where the series would have been drawn if it were not cropped will nevertheless triggers a “click” event.
For an example, see http://jsfiddle.net/mpcpno32/1/ . In this example, the third data point is cropped; but clicking the title would raise its “click” event.
This can be confusing; especially if the legend is placed on top of the plot area, the legend’s click event will no longer trigger because the (invisible) data point’s click event takes precedence.
Please take a look. Thanks!