Data saving problem

Hello, I have a problem in my game that has been going on all my life and nobody has been able to solve it (until now).
The thing is that my game is a Parkour and it has a level system that saves automatically, this way you can continue playing another day. The problem is that some players have complained that they enter the game and the level resets, I don’t have a clear idea of what


Are you getting any errors if you try in R15 or R6?