Buggy mouse click and hover behaviour at tree panels

[anfla]

I'm working with tree panels since the beginning of the week. They work fine, as long as there aren't many nodes in it. The more elements I put into them, the buggier is their reaction to clicking, expanding and hovering over them. Expanding doesn't work, hovering highlights the wrong nodes (I'm hovering above my third node, but the seventh is highlighted!?) and clicking won't do anything, in most cases.

It seems like the mouse part of the tree panel needs an totally unique attribute (id, name?) to work? Navigating and expanding via keyboard works fine.

[anfla]

And:

I can't highlight the right node, but there's no problem with drag and drop.