Aatrox Q Not Knocking-Up

I play Aatrox jungle (please no roasting). I'd say like 25% of the time if I jump over a wall onto a jungle creep, it wont get knocked-up. I attributed this to the same problem where when you look around the corner to a jungle camp and see its empty then walk into full view of the camp and it populates. However, I just played a ranked game where I tried jumping into a rengar in a bush but when I landed on him it didn't do anything... it just gave me a nope... it didn't even do the landing animation, just went from falling to walking. I hope this can get fixed soon. Thanks!