I don't know if anyone else have the same problem but I am playing Darksiders on PC and ...

• lost my save game, I didn't delete the save game it just gone away
• So I started a new game
• Yesterday when I start Darksiders I was surprised that I had the old game back.
• But I lost it (today) again and Darksiders gave me the "new" save game

Any suggestions how I can fix this?