Save issue

Hello.
My problem is that i was playing this game an old fat ps3 from last friday.. Now the fat just freezes and won't recognize any discs.. My today workout is not saved because of freeze..
BUT
I have another ps3 (slim) i tried to watch that was my today workout accomplished.. NO!
And another issue.. I saw that my slim says that i hasnt done anything past 4 days.. But this website says different..
Why??
Ps. Sorry my bad english... Im trying to study it more xD