Old paid invoices coming thru as unpaid now

SUGGESTED

We had to run a Data Verification for another issue, and now 4 previously paid invoices have appeared back as unpaid on my Aged Receivables.  All 4 were posted and paid originally in 2019, so I don't believe I can go back now and repost.  Cash/bank/financial reports all seem to be okay, which is the really strange part to me.  I have gone in and checked the cash receipts for those original posted days, and the cash isn't there.  Any ideas?