I have a small issue with my POTC and I am wondering if this is a common problem. When I shoot the ship, only the first one (the interceptor), the post comes up holds the ball, and when the post drops the ball goes sdtm (8 times out of 10). The post in the retracted position protrudes about 1 mm above the playfield and the ball touches it on its way down. Should the post be flush with the playfield? The machine is level.