In order to make it tally, search for duplicated transactions, Paid Amount exceeds open credit amounts in payment & Credit Note does not match with any billed invoice.
Search data tables from Housekeeping, Administrative tools, and Database Viewer for duplicated transactions.
Check on the payment transaction with reverse knock-off to check on the Open Credit and Balance Amount.
Check in owner ledger, the Credit Note document details, and the payment details of the credit note.