Why do Final fantaisie IV The After Years corrupt all saves?

Whenever I play my Final fantaisie IV The Complete Collection to my PSP and I play Final fantaisie IV and Final fantaisie IV ~Interlude~ it works fine.But whenever I play Final fantaisie IV The After Years and advance a little at Ceodore's Tale all my save data corrupt.Do bạn know if it has a problem hoặc something because it's really annoying.