3818888 - Why was the invoice assigned to a new temporary vendor and not to an existing one by the OCR?

Several invoices sent to a capture alias were assigned to the 'Unassigned queue' with a new temporary vendor. What's the reason for this happening?

Invoices being processed by the OCR are assigned to the vendor by matching the street address on the invoice to the Address1 field in the vendor manager. If a match cannot be found the invoice is assigned to the New Vendor and sent to the Unassigned Invoice queue. , KBA , CON-EXP-ADM-MOP , Monitor Payees , CON-SRV-TRV-ADM-VMG , Vendor Management , Problem