added new name server to zone are missing from the slave

[Gregory Machin]

Hi.
I have added 2 new name servers ns3 and ns4 to my zone, when I use dig
against the master they are shown in the list. When I do a dig against
the slave only the original servers ns1 and ns2 are there, I have
deleted the slave zones files and even after transferring the zone
again I get the same results.

Master (ns1):
root at ns1:~ # dig @127.0.0.1 mydom.com

; <<>> DiG 9.2.4 <<>> @127.0.0.1 mydom.com
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 61847
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 4

;; QUESTION SECTION:
;mydom.com.                 IN      A

;; ANSWER SECTION:
mydom.com.          86400   IN      A       x.x.64.254

;; AUTHORITY SECTION:
mydom.com.          86400   IN      NS      ns4.mydom.com.
mydom.com.          86400   IN      NS      ns1.mydom.com.
mydom.com.          86400   IN      NS      ns2.mydom.com.
mydom.com.          86400   IN      NS      ns3.mydom.com.

;; ADDITIONAL SECTION:
ns1.mydom.com.      86400   IN      A       x.x.64.242
ns2.mydom.com.      86400   IN      A       x.x.64.254
ns3.mydom.com.      68400   IN      A       x.x.32.7
ns4.mydom.com.      68400   IN      A       x.x.32.9

;; Query time: 1 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Dec 20 15:06:52 2011
;; MSG SIZE  rcvd: 183





Slave (ns3):

root at ns3:/var/lib/bind# dig @127.0.0.1 mydom.com

; <<>> DiG 9.7.1-P2 <<>> @127.0.0.1 mydom.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 38068
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 0

;; QUESTION SECTION:
;mydom.com.                 IN      A

;; ANSWER SECTION:
mydom.com.          86400   IN      A       x.x.64.254

;; AUTHORITY SECTION:
mydom.com.          86400   IN      NS      ns1.mydom.com.
mydom.com.          86400   IN      NS      ns2.mydom.com.

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Dec 20 15:06:29 2011
;; MSG SIZE  rcvd: 83


Any suggestions what would cause this ?

Thanks
G