[GAMEPLAY] I did not get my evolved Leap on Kha'Zix.

I was casually playing Kha'Zix the other day when I leveled up to level 11 after that i went to evolve my E and when I did it showed the Channeling bar of Kha'zix Evolving but i did not get the wings nor did I get the increased leap range after that I went to evolve my W and it also did not give me the Evolved Void Spikes. I was very unhappy with the fact that I was level 16 and I only had evolved Q. I have not encountered this bug since that game but It still shouldn't have happened.