Main content covered by footer

I am having an issue where the footer is appearing over a massive part of the page content and not and the end of the content where it should be. When I go to the page editor and click the “Preview Changes” button, the page displays properly, and sometimes when I am logged in as admin through the dashboard it will display properly when I go directly to the URL but not always. But when I am not logged in it will never display properly

You can see the issue on this page most obviously http://nathanbrammer.com/gallery where the footer cuts across the “Events” page link there should be another 2-3 link images below this before the footer is displayed.

Please help