Late last night a registrant logged in to pay. The transaction went through as it should, only charging him once. But register sent 10 payment confirmations each recalculated as if he'd paid again.
His record also indicated that he'd paid 10 times. I corrected it and it seems to have stopped.
If you have the latest DT Register, this would not happen. It was a bug in a recent package. Make sure you are running the latest, which at this time is 2.6.4b.
Did a little troubleshooting on your site and can't replicate this issue. Maybe it was a onetime thing. Hard to say what caused it. If it happens again, submit a ticket.
Our test registrations were not done the regular way... so we tested showing data that looked like a paid paypal registration. All looks fine.