Fort Knox Pawn Stealing Bug

[Darugo]

I found 2 handguns on the ground the other day and decided to pawn them off today at the Fort Knox place, I sell him both of them, and then decide that I want to also sell my Gold Uzi (i had 2, and didn't really like dual), so I sold one of them. Upon going to the ATM I noticed it:

A) didn't give me $50 x2 for my two handguns
B) took both of my gold uzis, only gave me back $200.


:[
any help?