Credit Card Refunds — Cancelled Performance

Hi all!

A performance at my organization was cancelled and so we are processing CC refunds. A few remain from web MOS that do not show account info. The payment window displays payment method, last 4 CC digits and expiry yet we  can't refund to the card. I checked both references and our securities app to make sure power users have rights to web MOS payment methods. They all have access yet no one can refund. Could this be a PCI issue cached by our processor? Still a bit new to the organization and thought maybe someone else here might know.

Thanks so much!

M-C