Sparklz - As a seller over the years there have been many occasions where buyers have gone through checkout once and I have ended up with more than one payment.

Paypal (or eBay) used to split the payments depending on what postage service was being offered on the listing. ie if some were for express and some were for regular they would split those.

These days they seem to be splitting the payments even when  the postage service offered is the same.

Digital - I would say most likely yes the sellers have received multiple payments.