Kai'Sa Bug White Box Augmented E

Sorry in advanced english not very good

Kai'Sa Bug Don't know why but when I augment E (Supercharge) for bonus atack speed a white box appears ways above Q(Icathian Rain) for the rest of the game. The augmented E(Supercharge) still works fine just annoying white box for the rest of the game.

Happend 2/2 so far if nesscary more information can be provied.

Maybe me playing on windows mode have a something to do with it? Is it just my comuter or is it happend to other peoples?