From what I see, I understand that you made the change to direct payment, but that you already had payments made through the pay later.
You have to understand that when you make a change, it only affects the sales you make going forward and not retrospectively.
In your current mode, direct payment. I understand that the payment for sell game is made directly to your merchant account, it does not go through itch. Therefore, this balance can only be a remnant of a transaction prior to your change.
If you think there is an error, it is best to contact support directly.