Welcome @b0n3zx! Sorry to read about your save file. The same thing happened to me while transferring my main character at the time between memory cards to play with friends. So they were permanently on the multiplayer slot which meant no solo mode ever which was frustrating.
You will love this community! There are lots of active users at every level of play, an informative and supportive staff and friendly forum users that are very knowledgeable. I've been playing on this server for almost a year and it has been one of the best experiences of my gaming career.