no authoritative answer from master server

[Fernando Soria]

Hi list...

I got a name server (BIND 9.2.3) and configured a zone (dnsdigital.com.ar)

That zone has a master name server called ns1.dnsdigital.com.ar in the same
machine and a slave server registered in zoneedit
My doubt is when I ran #dig @ns1.dnsdigital.com.ar dnsdigital.com.ar got non
authoritative answer but when run #dig @ns17.zoneedit.com dnsdigital.com.ar
it has authoritative answer...
That (I think) is no big deal because apparently its working fine but I
wonder why my master server hasn't authoritative answer for himself
Any idea?

Sorry about my English I'm from .ar ;) 
Thanks in advance