One Shortcode Menu Doesn't Work

I did some testing. Shortcode Menu works fine as long as it’s not on a child page underneath this primary page – http://www.dev.centerforartinwood.org/exhibitions/. I deactivated the grid plugin on that primary page, but Menu Shortcode on the child page still didn’t work. As of now, I made the child page a primary page to use the shortcode. Here’s the page with the working shortcode. Why is the parent page causing this? I’m using Shortcode Menu on other child pages.