Rengar unlimited spells bug [Gameplay]

I just played a game as Rengar when suddenly a weird bug occured. I was around level 10-12. When i reached 5 ferocity ( not the first time in the game) my enhanced spell worked as intendet but after using it my spell-icons didn´t change back to normal colours and i was able to use my E and W without cooldowns and just permanently spam it. I am not sure about the Q because it prevents the ability from being used again if you still have the buff for your next autoattack. R had cooldown as usual. I spammed around a little while and then entered combat again. i was still able to spam my abilities but after reaching 5 ferocity again and using the properly working enhanced spell i wasn´t able to spam anymore.

I don´t know how to reproduce this bug but it definitely needs fixing.

• PromQueenFelix