Yasuo Windwall Bug

There is a bug involving yasuo's windwall (W), it is blocking skill shots that it should not be. i had it happen 3 times in my past game, Yasuo threw the windwall (w) the complete opposite direction and it blocked a skill shot before it even came in contact with it. Best way i can explain it.... Rengar bola -----> yasuo windwall ------> . no reason it shouldve been blocked.