Every once in awhile I’ll be confused by an amount being charged to my credit card, however, when I investigate the charge I tend to find the charge was for something that I forgot I bought
Sometimes charges don’t immediately hit the hotel bill. Thus something bought a few days earlier like at DS or whatever, may not actually be charged until later, even after you’ve settled your bill. To verify that OP did indeed not get the correct amount refunded OP would need to add up every item they purchased (including food & tips) through out the entire stay - not just the last day - and compare that to what they actually were charged.