Client Portal Total Invoice and Dashboard Total Revenue Incorrect

Seems to be an issue with Credits where it will count them on top of previous revenue. There should be a way to apply a payment/invoice to credit and not have future invoices paid by credit count as additional revenue.

Currently a client pays up front for service, then a credit is manually entered. In the future as work is completed new invoices are made and credit is applied to those invoices till the credit for the client runs out. However when applying credit it's counting as additional revenue. Perhaps I'm missing something but in this scenario it seems the system is counting one payment as revenue twice.