Charged wrong amount after using Gift Card

I have two issues, and I’m not sure if they’re related or not.

I had a customer make a purchase. His order total, including shipping and fees, was $224.78. He used a gift card with a balance of $150. It looks like the gift card only applied to the shipping amount of $74.78, but he didn’t get charged at all for the remaining order balance of $150.

I did an order myself to see if it would work right for me. The total for the order, including shipping and fees, was $216. I applied a gift card that I had created for $50, and when I checked out, it said the final amount was $156, which is accurate. The problem, however, is that it only charged me $116. It looks like it somehow applied the $50 gift card twice.

As I said, I don’t know if these issues are connected at all, but I need to find a way to solve both of them.

Thank you!
Larry