There is a possibility that you have configured the receipts printing in such a way that ut gives you the Punchh Barcode and your QR code for survey or any other info very close to each other.
This generally results in an error as the device will end up scanning the QR code instead of the Barcode and display the error message.
To prevent this issue, please be advised to either print a smaller QR or add a receipt message above the QR to clarify it's for a survey and not for check-in. This will allow getting appropriate space for scanning the barcode and also avoid any confusion caused for the guest due to multiple scanning options available as Barcode and QR code together.
For e.g.: 
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