[In-Game] Visual Artifact during/after evolving Kai'Sa skills

I'm not exactly sure how to reproduce the situation. It has only occurred on her classic skin (I don't own her Bullet Angel).

It definitely happens with her Q and E, but the space between them implies W is affected as well.

The visual artifacts in question are grayish white rectangles, upper left section of the screen. About 1/5 or 1/4 from the top of the screen and 1/3 towards the center from the side.

It may have to do with the fact I've set evolve hotkeys to be the same as rank up which has also lead to some visual discrepancies around that area of the HUD but no functionality issues, as it will always prioritize the evolve over the rank up.

Something to look into, but these spots aren't so big they really hinder gameplay. Also, they've always disappeared after a short time.