Doesn't make new saves! (Batman: Arkham Asylum)

Hello to all. Such a problem: I just started the Batman game (I confess, I am a sinner), everything is fine, no lags and bugs, BUT .... I played a bit, turned off the computer, then I go into the game, and the game loads from the moment when only the first time needs to be done Silent Takedown (silently knock out the enemy). I thought okay, maybe saves are rarely done ... I played for 2-3 hours, went to the university, came back, I turn on the game ... and I am loaded again from that very moment ... Tell me what to do? Game version - Game of the year edition (pirate)