Just looking through the source of the site, it seems that whatever CMS you're using is inserting <p> tags everywhere, including around the opening and closing <section> tags: http://i.imgur.com/RkoFP.png.

It's also causing the page to fail validation (ignoring the errors about unknown meta tags): http://validator.w3.org/check?uri=http%3A%2F%2Fpaulstamatiou...