mouseleave behave like mouseout

[jfmmm]

You code seem to replace mouseleave with mouseout, witch is bad. If you have child element in the element you binded the event to, mouseout will trigger for every child as well as the targeted element. Mouseleave fix that and trigger only one when you exit the element you binded the event on.

removing this code fix the issue for me :

    mouseenter: {
        attachesTo: 'mouseover',
        eventTest: function(evt) {
            return (! withinElement(evt, evt.originalTarget(), 'fromElement'));
        }
    },
    mouseleave: {
        attachesTo: 'mouseout',
        eventTest: function(evt) {
            return (! withinElement(evt, evt.originalTarget(), 'toElement'));
        }
    },

why is this there?

[jfmmm]

jQuery has a nice demo to explain the difference between the two if needed (bottom of the page).
https://api.jquery.com/mouseleave/