I am working on a site and using 3 variants, one full size at 950p, a tablet size at 650p and a mobile size at 450p. The full size site works fine. I am using the new "stretch" features in Web Designer 11. However the mobile and tablet variants load off center, justified left, and the stretchy objects do not reach all the way across. Can someone point out what obvious mistake I am making so I can correct it? Thanks!

Here is my test site:
www.williammertz.photography/mbay