A new address was imported as the preferred address. The old address with the County field populated is now an alternate address. AddressFinder does not update the County field as this is not a field constituents can fill out when notifying the Post Office of a Change of Address
Use CountyFinder (BB73313) to update the County field in your database. For more information or to purchase CountyFinder, contact your account manager.
If you have AddressAccelerator, validate the addresses (BB133016) processed through AddressFinder to populate the County field
Manually or globally (BB94413) update the County field for the new forwardable addresses