This is a double-dipping situation where a user is earning points from online order and scanning the QR code on the same receipt with a phone. To resolve this issue, POS should be configured to not print QR codes on receipts that have already earned online. No configuration is available on Punchh's end to disable barcodes. Please reach out to Toast.
If further assistance is required, submit a ticket to Punchh Support. (For help submitting a ticket, click here)