Contract invoice is not marked as paid

Summary:

We have a paid contract invoice which is not marked as paid in Contracts. Invoice in AR:

Invoice in Contracts (or Unpaid amount is equal to the specific invoice):

We have started process Confirm Invoice Acceptance.....

Is there a way in Contracts to see if an individual invoice is paid?

Content (required):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):