I can't really tell because of your permalinks settings (or lack of). BUT, are you sure you are using the Category Podcast feed or are you using the plain old wordpress category feed?
I just remembered, Category podcasting just adds podcast tags to the wordpress generated feed so there is no Podcast-only category feed.
Is there a reason you are using category feeds for your podcast?
If you only have one podcast you are WAY better off using the main podcast feed for podcasting. You can still use categories to organize your site.
-Mike