Board Thread:General Discussion/@comment-7810843-20130408120930/@comment-303594-20130408192518

You seem a little confused. Categories shouldn't link to the main page, and they aren't automatically added to it when created. Categories are added to a page, and that causes them to be listed in the page Category:Category name, regardless if the actual category page exists. To completely remove the category from the wiki, you need to edit each page that the category is in, and remove that.