Why is the wrong customer receiving a receipt for another customers transacation

[ahale95]

I have a customer who keeps receiving another customers receipt when she visits my salon.  The other day she was at a different square merchant and that merchant's square did the same.  

I do not have their client info comingled.  

[VanKalkerFarms]

Someone else incorrectly entered their email address or phone number.  at the bottom of the receipt, there is a place to click to say this isn't mine for the person who is getting the wrong receipt.

https://squareup.com/help/us/en/article/4989-incorrect-receipts