I remember a issue like this on my Spirit of 76. This may sound odd but start your game then launch the ball let it bang around a bit if it kicks the ball back out launch it again until the game ends even though it's not scoring. Then start a game and see if it scores. On my Spirt if you powered it off mid game it would do this you basically had to finish the last game before it would start scoring a new game. I fixed it and I may have even seeked help here on pinside to do so.

Hope this helps. It's a short read. https://pinside.com/pinball/forum/topic/spirit-of-76-game-reset-if-turning-off-game-before-its-over