Once Lee Sin Q's someone, and he tries to jump to them, he lags out and freezes.
If the opponent is running toward the tower, Lee Sin will take agro from the tower even though he is much to far away to be hit. This is a bug that should be fixed ASAP as any Lee Sin player has a significantly unfair hindrance to their regular gameplay.

Thanks Riot.

Im pretty sure its just lag cause of server issues, though it could be a bug.

Last game in 3 occasions (playing lee sin) my champion froze in 1 place while chasing after someone, I could see them taking damage from my autoattacks, but my champion was still frozen in the same spot... it even made me dive once under a turret and another time into their fountain.

This lee sin problem has always happend, it's not because of server lag. It's just a bug that needs to be fixed in general.