Apple Pay Charging Wrong Card

I have three cards listed in my Apple Wallet, card A, B and C.

Card A is set as default, Carb B is my business card. Card C is a separate account.

On several occasions I have gone to a store, made a purchase having clearly selected Card B. An error appears with Card B still on the screen and it says the transaction failed. There are no other messages on the screen. I close the app.

However the payment successfully goes through on their machine using Card A and the money is taken from that account.

This has happened 5-6 times. I have tried deleting the card that has failed (it usually works fine) and adding it again, all without success.

Any idea please?