[GAMEPLAY] Ability Level Up Arrow won't go away

Hey all,

More often than not over the last few patches (not sure exactly when it started) when I go to level up an ability on a champ by clicking the arrow above the move (q,w,e), the arrow becomes slightly grayed out, but remains until the next time I level the ability again. This is pretty annoying when it seems like I've forgotten to level something and can't click it, or if this bug takes places when ranking for the 5th time and is then permanently stuck for the rest of the game. To be honest I'm not sure if it's purely visual (and haven't even thought about it until just now) but doubt that my skills are actually not leveling.

I've never really reported a bug before and usually whatever I notice eventually becomes fixed in the next patch, but this time it's been a while and I haven't seen anyone else mention it. I'd say by estimate it actually happens about 40% of the time but seems to be getting more frequent. Unfortunately I do not have any screenshots, nor would I know how exactly to provide one. So if there's any confusion on what exactly I am talking about just let me know and I'll see if I can explain it.

Thanks!