Just found a weird error by mistake, with no error codes popping up. Apparently if you don’t have your flag mounted, traders will still accept your items you sell them, just won’t give you any money for them.
I had attempted to move my flag, but for some reason it went to a stockpile instead. Upon selling SEVERAL items, I noticed my gold was still at 0. This is when I realized the flag was still a ghost, and had not been placed. So I replaced the flag, sold an item, and BOOM, I only got the money for the item sold after the flag was placed.
SO I WANT A REFUND!!!