There is a rather nasty reset bug out there that seems to be hitting certain players of Borderlands 2. As reproduced above by YouTube user RyogaWanderer, players affected by the bug are finding their badass totals reset, while the challenges they have completed remain marked completed — meaning that the players whose totals have dropped can't re-earn those lost tokens.
Items and upgrades purchased with badass tokens are also vanishing, without returning the tokens to the players' totals.
Players on the game's forums are reporting that this has happened on the Xbox 360, PlayStation 3 and PC versions of the game.
Gearbox community manager Chris F wrote on the forums that Gearbox is looking into a fix. In the meantime, players have suggested a variety of tips for avoiding the bug, which seems to relate to profile save corruption, on 360 and on PS3.
We've asked Gearbox for comment and will update if we hear back.
Badass rank reset to 0, skins lost, but challenge progress remains. [Borderlands 2 official forum]