Ive had a couple Gottlieb games where a credit was awarded to the wrong match number. The first game, Flip a Card, i wrote down ever reel/match digit combo and changed the lamp wiring. The 2nd game, Ice Review, i found that someone had assembeled the match contact disk on the reel in the wrong position. I never rechecked Flip a Cards reel, but think there is a good chance its reel was reassembeled incorrectly by a prior owner.