I'm having a slight problem with my Site Index for http://sorelboot.net. The link for my post tags http://sorelboot.net/post_tag-sitemap.xml is showing up as my main page and Google thinks it is HTML and not an XML sitemap. I've read that there could be a conflict with W3C Cache. But, I'm not using that plugin. I know it has to be something I am doing wrong, but I cannot seem to figure it out. Any guidance would be much appreciated.