A bug has accured with Turtle Rock Studios' newly released multiplayer game Evolve. Reports on Reddit have flagged an issue of players losing all their character progress when signing in to different consoles. Apparently it doesn't seem to help if you sign in to your 2K account on both consoles, and the only way to be safe is to save your game to an external hard drive.
Sources that Kotaku has talked to says that Turtle Rock is aware of the problem and is working on a fix.