The Aged Accounts Receivable is reflecting the credit balance of a record that has a future credit applied to the record.  This is caused by an Advance Deposit being funded by a future credit.  To resolve the issue:

  1. Unapply the payments and advance deposits
  2. Reapply the payments to the correct advance deposit
  3. Save and close the affected account
  4. Post to the General Ledger
  5. Re-run the reports