Not sure if a bug or just a consequence of tampering where one does not belong, but here's what I've encountered:
I decided to swap a grid layout in ability tooltip with tables, as I could not achieve desired precision of column alignment with grids (had to use spaces for adjustments, which was not pleasant), and after making the replacement I found out that tables produce a constant sound of mousing-over whenever I do actually mouse over them. My guess was that it was due to the tooltip constantly re-rendering, and tables are created by default without said re-rendering in mind.
Precisely speaking, each created row is in some way a Button, therefore at creation it is assigned setMouseOverSound("ui_button_mouseover"). Initially I thought the UITable instance is responsible for this behaviour, and tried to call setItemsSelectable() on it, but it turned out to be false. In the end, with the help of kind Viravain and Lyravega I was able to fix this behaviour by calling setMouseOverSound(null) on each row, but it's not exactly an optimal or easiest solution.
Perhaps an argument could be added to beginTable() in TooltipMakerAPI to have the rows created be without mouse-over sound? Of course hardly any modder finds himself with an urge to shove a table in his ability tooltip, I understand, and it does seem like a bit of work to implement...
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