I blame your ISP. :heh:
No, really, the DNS is on the same machine as the website is, and you're getting the same nameserver regardless of what domain you use (outpost2.net, outpostuniverse.net, outpostuniverse.net)
Perhaps there is something misfunctional with the ISP's cache (since it just delegates the DNS lookups to the actual nameserver(s) if it's not in the cache, perhaps it had some issues doing the DNS lookup (against our server) at the time, where the DNS result for the forums might have been in the cache and thus that problem wouldn't exist).