QBO, Credit card reconciliation balance flipped from positive to negative?

Hi there, mgfigueroa.

You can resolve the overpayment by entering the amount as a negative on the ending balance. Doing so will offset the transaction on the following month when payment is applied. 

For additional guidance on the best thing to do in this kind of situation, I suggest reaching out to your accountant. This is to ensure correct tracking of your account. 

Should you need further assistance, let me know by commenting below. I'm always around to help.