Hey,
I have found a certain "logic" with this problem, it seems to happen when the description of the game (note metadata) is a certain length for the gamedetails windows.
If i resize the gamedetails panel, it does'nt occur no more on this particular game (but will on others ones that did'nt dance before)
At some point of "zoom" the theme don't know if it has to display a scrollbar or not to display the notes.