7 years later, but I feel like I must answer this, maybe someone else end up here and this may fix their problems.
If you are having family issues like this, it seems variables dont work properly, or any of your enemies in the family starts to behave oddly, anwser this question: ¿Are you using Platform Behaviour in those enemies? If so, ¿are you sure all the enemies in the family have the same Player assigned? Try to change all your enemies to be Player 10 for example, and run the game.
This happened to me in the past, I delete a bunch of code and chacters, and finally I fixed that by changing all enemies to the same Player