Hello @HighVizzer, interesting. It sounds like you might have chosen Cash or Other Tender while ringing up this customer. If you're on your Square Dashboard head to the Sales tab on the left and then select Transactions at the top of your screen.  You should now see all of your transactions displayed for a given timeframe. 

If you see the symbol below it means that the Cash option was selected when checking out the customer. 

You can refund this payment if you wish to balance your report. The customer will not receive any notification of this unless you re-issue them a receipt. 

When checking out a customer you will want to select the debit or credit option to keep this from happening again.