Why is an email and phone number already in the boxes after I swipe a card?

[Mschermsa]

When I swipe a card the next page asks where to send the receipt - by email or phone. Mine comes pre populated with an already used email and phone number. Why is that?

[VanKalkerFarms]

the card has been used at another retailer that uses Square, Square keeps the data for email and text associated with that card for faster checkout on future purchases.