When I go into create-a-player and edit an actual NHL player, the changes usually save. But every once in a while, it wipes out all my changes. (Very annoying!!!) I thought it might be my memory card, so I bought a new one. Same thing happens. Is this a problem with the game itself, my Gamecube, or perhaps corrupted files saved from my old memory card?
The disc of the game that you are using is causing this problem. This is why the game’s data can't be save to your memory card. Try to change the disc.