All full paid purchase invoices is today showing as Unpaid!!!
You have double-posted this issue. Please do not, as that slows down getting answers.
You need to illustrate this issue with screen shots. Remember, no one can see your data unless you do. You also need to tell us what edition (desktop, server, or cloud) and version number.
it might be due to 2 actions either the bank entry is deleted by mistake Or in the bank entry either the supplier or that particular purchase invoice number not matched.
Please goto Receipts & Payments , search and find that particular entry by name of supplier or by date of transaction, edit that and check if the supplier and the invoice is correctly entered.