From what I recall, it gave me 4x $20 bills instead of 2x. I attempted the transaction, it made this “flipping bills” sound for an unusually long time, then gav

From what I recall, it gave me 4x $20 bills instead of 2x. I attempted the transaction, it made this “flipping bills” sound for an unusually long time, then gave me a “dispense” error message. But obviously the cash had partially made it through the machine and got stuck somewhere, because when I retried the transaction, it gave me both the cash from the successful transaction, and that from the earlier failed one. Only the successful transaction ever appeared on my bank statement as a proper ATM withdrawal, but obviously they somehow detected the previous one and processed it manually.