I'm assuming you mean the gun turrets on bombers; if so your answer is: as you occupy a gunner position, the game tries to make every movable gun move towards the area you are pointing at in order to assist the gunner in bringing as many guns to bear on a target as fast as possible. Example: if you are in the tail gun of a B17, the nose gun will try to move to point backwards, this normally results in the nose gun pointing hard over to one side or the other. Of course this can be frustrating if you have to quickly jump from tail to nose position. If you return to a non-gunner position for a few seconds, all the guns move back to thier default position.