gallery images only on half the page

I just installed your theme and am beginning the setup, Ive created a static gallery page for the home page. I love the mosaic tiled images but they are only showing up on the left hand side, as if there is a hidden side bar or something on the right. I’ve clicked on the “without sidebar” option in the page dashboard, chosen default template and gone in to the customize appearance and disabled all the homepage options. I don’t know what’s going on and why I can’t get it to fit the entire width of the page. Your sample galleries page fits the width of the entire page, I’d like mine to do the same.
Thank you.

The page I need help with: [log in to see the link]