First time using instavolt, started the charge with my fuel card (RFID) but had to pay with bank card at the end?

Bit of an odd one! I started the charge using an allstar fuel card but at the end of the charge the charger was requesting payment still and wouldn't accept the fuel card - I ended up paying with my bank card but then a few hours later instavolt refunded my account?

Wondering if anyone could tell me where I went wrong or if this is a charger to avoid in the future?

Im half convinced I maybe was meant to ignore the card reader and just drive off!