I play this game for almost one year and there is a bug that still in the game since them. Sometimes when you are on the sniper mode and turning your aim to the target and fire when it gets there, but the shot goes not there. Then you get out the sniper mode to see what the hell is going on and realise that in fact your gun wasn't pointing to the target.
This bug happens with a significant frequency, enough to me realise that it usually happens when you are turning your turret with a building in front of it.