Subdirectory mirrors overdirectory? 404 WTF

[MTGDarkness]

This is rather confusing...

Basically, I have my forum at http://forums.mtgdarkness.com, and then I have some subdirectories at places like /chat/ (AJAX Chatbox) /wiki/, etc...

Well, check this out: http://forums.mtgdarkness.com/chat/
Or this: http://forums.mtgdarkness.com/s/absolutenonsense
I assure you, there is no directory called "absolute nonsense" on my server... I don't know what's causing it. I disabled all my plugins and products and that didn't change anything...

I also checked my other directories; it isn't happening on my other subdomains... Unless it has vBulletin on it! It's the same thing in my testvb directory... I really don't know what's causing this.

[Lynne]

Do you have an htaccess file that may be doing this?

[MTGDarkness]

There are no htaccess files on the server. In fact, it goes so far as that a 404 page that isn't the directory index (for example: http://forums.mtgdarkness.com/itrader.php-I don't have that file any more) does the same thing.

[Lynne]

Well, it isn't default vbulletin that is doing this. Have you tried asking your host for help resolving the issue?

[MTGDarkness]

No. I will.

Oh wait, here's the rub: the admincp directory is just about the only one that works.