User blog comment:DaNASCAT/Technical Update: October 21, 2015/@comment-2112602-20151024081340/@comment-1757994-20151025021822

There are unmatched tags on your main page. Starting with Season 2 of the Originals, the headers appear outside mw-content-text, so look for an extraneous in your mark-up just before that. It could be another tag that's unbalanced, but it's usually a div. It could be coming from a poorly-coded template that you've transcluded, too.