Twenty Seventeen theme issue

http://testbed.5pin.link
If you go to this test site, you can see i have created a static page as the main page, however when ever i enter any content (Just lorum ipsum here) it is over the right hand side of the page, any ideas what is causing that, i do not have it right justified or anything, and i change back to posts instead of static page the layout is all correct.
Anybody got any ideas ?