Pages not full width even when "full-width" template is selected.

Hello!

I just started using the hatch theme and for the most part I really like it. I am having this issue, though, with my pages.

http://www.natsuocosplay.com

That is my website. If you click on the “Costumes” link on the menu, you will see a super long, thin page with a ton of pictures on it. I am uncertain why all of the pictures are listed one after the other and not side-by-side. I have “full-width” template selected, and also in the html of my actual page, there are no breaks or paragraph changes between the pictures.

Could anyone explain why this may be happening? Thank you!