Hello, I think I have encountered similar issue to this one #329 using the Tooltip component.
I'm using version 6.6.1
React:
<Tooltip content="Layers" >
<IconButton icon={LayersIcon} appearance="minimal" onClick={() => toggleMenu(Menu.Layers)} />
</Tooltip>
Looks like tooltip creates one extra div on hover, see:
Before hover:

On hover:

After mouse leave:

I suppose #330 did not fix the problem or am I missing something?
Thank you for such a great library guys. 😊