ARAM Snowball bug

Sometimes when I cast snowball, it shoots in a random direction where my mouse was not. I just assumed that I was flicking my mouse in a different direction or something, but after countless times of this issue happening to me and my friends, I am certain it is not a bug. I've also found many players who experience the same bug, and I still have found no correlation to when the bug occurs, it just seems to be random. It is quite annoying because it can prevent a massive engage opportunity, kill, ending the game, etc...