Category RSS Feeds Not Working

I am having problems with Category specific feeds. I have read quite a few blog posts / support questions but nothing suggested has worked so far.

My website is: http://www.peterryan.net

I am trying to setup the following feeds:

http://www.peterryan.net/category/cooking/feed/
http://www.peterryan.net/category/geek/feed/

The results are inconsistent. Sometimes the correct feed is returned but other times the same feed is returned regardless of what I select. Right now (regardless of reader: FF, Thunderbird, Google Reader) I see the same feed no matter what url I type. Essentially

http://www.peterryan.net/category/cooking/feed/
http://www.peterryan.net/category/geek/feed/

Return the same data!

I have a Debian Etch system with the latest (2.2.2) wordpress. I am totally at a loss if this is some kind of caching (which I am starting to think might be the problem) or if I have further configuration with wordpress I am not aware of. I am running other sites (php4, rails) on the apache2 server without this undesired “caching” issue.

I would greatly appeciate the help!

Additionally my htaccess is:

<IfModule mod_rewrite.c>
RewriteEngine On

RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>