Hmm, from memory the ball definately shouldn't roll out on its own. Also what version of game ROM are you using. There should be an option to calibrate the gun too.
Not sure about the Rom version ,will look into it when I get home .
I did do the calibration test seemed to be all ok there .
All fixed ,In my hurry to have a quick game before work Welllll I didn't adjust the legs ,so the right side got the once rear legs .
But I'll tell you I thing she seems to be a rippa .