Money won at casino replaced cash instead of adding to it.

I had a little over $900 in cash on me when I spun the wheel. It landed on $500 slice and said I won $500. When I checked my cash a few seconds later I only had $501 dollars. Yes $501.

My bank stayed the same unless i'm stupid and wheel money goes to the bank. Im pretty broke so an extra $500 in the bank is should be noticed by me.