Not recognising save on memory card

[DarthJarJar]

So I was playing pokemon colosseum and saved in game, I also made a save state, and when it said in the top left that it had saved it to file xxx.raw I closed the game. Now when I opened it again, it is not recognising that a save is there in the raw file and won't let me continue. However, I opened the raw file on pkHex to check and all the data is still there for the pokemon at least so the data isn't gone but it still won't let me open the game. Now when I try and save in game after opening the save state it says it isn't the same memory card. This happened just earlier today as well however I moved the raw files to the bin and back and reset and it started working again, but now it won't work at all. I have kept a backup of the raw file in case. Any help would be appreciated.