Somethign screwy with DNS entry

OK. We have a web server with an internal address 192.168.0.254, and an
external address of 12.14.16.18. The way our network is set up,
inside our network, on 192.168.0.x, we can only access that server from
the internal address. Attempting to access it with the external address
fails. This is fine. Here is the problem:

We have a Windows 2003 Server which is our primary DNS server, at
192.168.0.246.

It has DNS Host entries for intranet.ourdomain.com and
security.ourdomain.com, which both point to 192.168.0.254. These
entries also exist externally, though godaddy.com or some such, pointing
to 12.14.16.18. We also have an internal entry for test1.ourdomain.com,
which points to the same internal address, but has no outside entry.

I have verified that my system has the primary DNS server, our internal
....246 server. I have verified that it is working by pinging
test1.ourdomain.com. It returns the ...254 address no problem.

However, if I ping intranet.ourdomain.com, it shows up as
security.ourdomain.com, with the 12.14.16.18 address.

If my internal DNS server is working, and is first in line, and has a
valid internal address for these two domains, why is it giving me the
external DNS entry?

What is broken? Note that all of this is served up from DHCP by that
same Windows 2003 server, and other machines will ping out ...254 in
response to those domains. No, it is not my Host file.

Phil