option one - some psp savegames are made so they can only work on the psp they were created, for example Tekken DR or Djmax portable 2
option two - you have different firmwares on each of them, is not your memory stick, is just that sony forgot to lock up some games with their respective updates; the saves act like corrupted if they were created on older firmware and then you try to load them on a newer firmware
$ony is stupid, I know
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