dominio.com.mx.dominio.com.mx on dig

[Cosme Morales]

ok, after a minoucios check of my db.zone files I could not find
why my Bind is doing this !

some days ago was working good, but suddenly my domain
appears to be freaked

doing a DIG on a common PC gets this:

mymachine% dig dominio.com.mx

; <<>> DiG 8.3 <<>> dominio.com.mx
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0
;; QUERY SECTION:
;;      dominio.com.mx, type = A, class = IN

;; ANSWER SECTION:
dominio.com.mx.  23h37m36s IN A  55.55.55.55

;; AUTHORITY SECTION:
dominio.com.mx.  23h37m36s IN NS  thunderbird.dominio.com.mx.dominio.com.mx.

;; Total query time: 7 msec
;; FROM: mymachine.com.mx to SERVER: default -- 0.0.0.0
;; WHEN: Sat Sep 13 05:48:52 2003
;; MSG SIZE  sent: 39  rcvd: 103


I hope some one can help me as you can see on Authority Section sends
repeated
dominio.com.mx.dominio.com.mx

This is a copy/paste of my db.zone file

$TTL 86400
dominio.com.mx.   IN      SOA     thunderbird.dominio.com.mx.
me.dominio.com.mx. (
                                                2003091301
                                                10800
                                                3600
                                                604800
                                                86400
                                                )

                        IN      NS      thunderbird.dominio.com.mx

dominio.com.mx.           IN      A       55.55.55.55
thunderbird.dominio.com.mx.   IN      A       55.55.55.55

gw                      IN      CNAME   thunderbird.dominio.com.mx.
www                     IN      CNAME   thunderbird.dominio.com.mx.
ns1                     IN      CNAME   thunderbird.dominio.com.mx.
mail                    IN      CNAME   thunderbird.dominio.com.mx.
ns2                     IN      CNAME   thunderbird.dominio.com.mx.
ftp                     IN      CNAME   thunderbird.dominio.com.mx.
dominio.com.mx    IN      MX      10      thunderbird.dominio.com.mx.
dominio.com.mx    IN      MX      20      thunderbird.dominio.com.mx.

any Idea ?

thanks everyone !