Try each of the following steps in order until the issue is resolved:
1. Ensure the correct address is selected in the query output. 2. Ensure all address fields are selected from the same category in the query output. For example, select address line 1, city, state, and zip from preferred address instead of all addresses. 3. If you wish to remove addresses marked as do not send mail, output the address from the Address Processing node in query. 4. Recreate the query.