Product Columns not working on Woocommerce Site

Hello! We are having a couple of issues with a client's site called numismax.com. On his "What we sell" page the columns are not working; the products are expanding out from edge to edge no matter the settings. Right now the site is under construction, so I will have to post admin login and FTP login credentials in a private post.

I would appreciate fast help on this one! Right now I'm the one in the hot seat and have tried everything I can think of to fix it =(

Thanks!
- Meredith