Lost money after a co-op game

Hi guys,

sorry for the disturb but i can’f find a solution for a problem.

I’m playing Borderlands: the handsome collection in co-op online with my girlfriend but we have an issue playing Borderlands 2:

Every time i invite her in my group then select to continue the game. one time she lost the weapon found in the last game but more important, every time she lost the $ gained. she will continue the game, evry time with 16k $ and no matter how many $ she reached in the last game. we tried also to play separately so she can save the game alone in her own game but the next time i invite her she have again 16k dollar…

we are doing something wrong!? is a bug!?

please help us, game is great but this thing is really really really boring!