Domain controller failing dns test

I have 4 domain controllers.  When I run the  "DCDIAG /TEST:DNS /V /E /F:C:\list.txt "  command on each of them 1 of them shows failed results.  The other 3 domain controllers show that everything passed.  

These are the results from the DC that shows failure.
 Summary of DNS test results:
                                            Auth Basc Forw Del  Dyn  RReg Ext  
               ________________________________________________________________
            Domain: domain.us
               morty                       PASS PASS PASS PASS PASS PASS n/a  
               Wally                        PASS WARN n/a  n/a  n/a  n/a  n/a  
               Vinny                        FAIL FAIL n/a  n/a  n/a  n/a  n/a  
               morty2                      FAIL FAIL n/a  n/a  n/a  n/a  n/a  
         
         ......................... domain.us failed test DNS


These are the results from the rest of the domain controllers.  
                                 Auth Basc Forw Del  Dyn  RReg Ext
            _________________________________________________________________
            Domain: domain.us

               Wally                        PASS PASS PASS PASS PASS PASS n/a  
               Vinny                     PASS PASS PASS PASS PASS PASS n/a  
               morty2                      PASS PASS PASS PASS PASS PASS n/a  
               morty                       PASS PASS PASS PASS PASS PASS n/a  
         
         ......................... domain.us passed test DNS


All 4 domain controllers have the same Preferred DNS server. The Primary DNS server is also the domain controller that is showing the failure in the DNS tests.  All 4 vary on what the alternate DNS server is.

Can you guide me to trying to figure out why this test shows failure on 1 of the domain controllers?