I did some research to find out what had happened.
This game has been cancelled from our automated payout system due to breaking upgrades. So we had to payout the winnings manually.
Unfortunately, your bet was made manually and it has an empty space at the end of the memo, and thus while searching for winners, it didn't come up.
We will be refunding the payment, as well as implementing a filter that removes empty spaces for potential future copy-paste errors.
Edit: As a token of apology for late response, I've refunded double the amount.