problems with the resolving some domain names

[Lode Rammelaere]

Hello,

I have only basic understanding of dns. So I need some help on the 
following issue.
We have problems with the resolving some domain names. ( for example 
fia.com ).
There are three nameservers that should have authoritative data for the 
fia.com zone:
ns0.oleane.net
ns1.oleane.net
ns.fra.fr
But when I query these servers for fia.com only ns.fra.fr has an 
authoritative response.
The first two servers have a strange answer:

<<>> DiG 2.1 <<>> @NS0.oleane.net fia.com A
; (1 server found)
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10
;; flags: qr rd; Ques: 1, Ans: 0, Auth: 13, Addit: 13
;; QUESTIONS:
;; fia.com, type = A, class = IN

;; AUTHORITY RECORDS:

 AUTHORITY RECORDS:
com. 114760 NS A.GTLD-SERVERS.NET.
com. 114760 NS G.GTLD-SERVERS.NET.
com. 114760 NS H.GTLD-SERVERS.NET.
com. 114760 NS C.GTLD-SERVERS.NET.
com. 114760 NS I.GTLD-SERVERS.NET.
com. 114760 NS B.GTLD-SERVERS.NET.
com. 114760 NS D.GTLD-SERVERS.NET.
com. 114760 NS L.GTLD-SERVERS.NET.
com. 114760 NS F.GTLD-SERVERS.NET.
com. 114760 NS J.GTLD-SERVERS.NET.
com. 114760 NS K.GTLD-SERVERS.NET.
com. 114760 NS E.GTLD-SERVERS.NET.
com. 114760 NS M.GTLD-SERVERS.NET.

;; ADDITIONAL RECORDS:
A.GTLD-SERVERS.NET. 146426 A 192.5.6.30
G.GTLD-SERVERS.NET. 121537 A 192.42.93.30
H.GTLD-SERVERS.NET. 123357 A 192.54.112.30
C.GTLD-SERVERS.NET. 119873 A 192.26.92.30
I.GTLD-SERVERS.NET. 120618 A 192.43.172.30
B.GTLD-SERVERS.NET. 126023 A 192.33.14.30
D.GTLD-SERVERS.NET. 122857 A 192.31.80.30
L.GTLD-SERVERS.NET. 175459 A 192.41.162.30
F.GTLD-SERVERS.NET. 445703 A 192.35.51.30
J.GTLD-SERVERS.NET. 127743 A 210.132.100.101
K.GTLD-SERVERS.NET. 115816 A 213.177.194.5
E.GTLD-SERVERS.NET. 120222 A 192.12.94.30
M.GTLD-SERVERS.NET. 175459 A 202.153.114.101

I do not understand this result, it seems that only the ns.fra.fr 
resolves
the correctly the domain fia.com and the other two servers are lame. Do 
I see this right our is there an other problem ? My external dns server 
(NT4 SP5) does not handles this problem right. I think he never tries 
all authoritative nameservers in the list.

Any & all assistance would be greatly appreciated!

Lode Rammelaere