Is this happening with multiple cards or did it just happen on one transaction you tried to run?
If just one, was it possible that the card was a preloaded card and the balance available on it was lower than the ticket total? In other words, the customer only had $5.00 on the card and the ticket was for $10? At which point it would charge the $5.00 to it and need an alternate form of payment for the balance?
