[Gameplay] Visual Glitch where Ability Level Up Button does not Disappear

This is a visual glitch that did not affect actual gameplay mechanics, but was slightly distracting. Basically, whenever I leveled up, all applicable level up arrows displayed properly, but once I leveled up an ability, the arrow above my e didn't go away. Screen Shot In the above screen shot, you can see that I already leveled up my q, but the game was still displaying the button to level up my e. Clicking on it did nothing, neither giving me a level I didn't deserve, or making it go away harmlessly.

I don't know what caused this glitch, but I suspect it had something to do with Alt-Tabbing out during load-in to mess around with the music I had playing in the background.

This is the first time it has happened to me, but 2 other people in that same game said that they had it happen in past games.