Hi there, jaygar.

The Account Receivable Aging Summary report displays the number of unpaid invoices that are outstanding and how many days they have been outstanding. This report depends on the due of the invoices. In other words, even if the invoices already paid, if the payment doesn't same as the due date or the date is before, the report still shows negative.

However, if you click the transactions from the A/R Aging Summary report, the invoices will shows paid.

The Customer Balance Summary Report tells you how much each owes you or the total balance of the customer. This report depends on the specific due date of the invoices.

Please check this article to see different reports that cater to your business needs: Understand reports.

Please know that you're always welcome to post if you have any other concerns. Wishing you and your business continued success.