zone transfer with DIG: SOA duplicate

[hugo hugoo]

Dear all,
 
I have this strange behaviour when I do a zone transfer with the following commande:
 
dig @name_server  zone_name AXFR
 
 
==> I received 2 SOA records (duplicates).
 
One SOA record is at the end of the received  information.
 
 
Is this normal?
 
 
Thanks for any feedback,
 
Hugo,
 
 
PS I used a DIG from a BIND 9.7 on redhat. 		 	   		  
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