Worpress 4-letter comment error

This is one of the weirdest bug’s I’ve seen. I recently uploaded wordpress onto one of my new sites, https://viewmixed.com/, and there is a strange bug when posting four-letter words. At first I thought you couldnt leave comments at all because I kept trying to leave a comment with the word “test”. I then realized that any four letter word seems to break the comments i.e. “four” or “1234”, but any other string posts the comment fine. I have tried deleting all the files/Database and then re-installing WP, and that didn’t solve anything. I’m on the newest WP version, 3.5.1, and I also tried installing 3.4.2 and 3.1.4, but none fixed the issue… Any one have an idea of what could be going on?

I do have a custom theme right now, but the bug was there before installing the theme, and I also tried changing themes, but the 4-letter bug doesn’t go away.

In chrome, submitting a 4 letter comments direct me to page that says “An appropriate representation of the requested resource /wp-comments-post.php could not be found on this server.”