Possible js conflict causing images not to load

I’ve recently noticed that the instagram plugin has stopped loading images on our site, and instead just hangs on the loader icon. I suspect this is due to a js conflict, as the console reveals an error related to the sbiajaxurl variable.

The feed should show beneath the “prep101uofc” title.

The plugin and feed works as expected in a core WordPress theme (Twenty Sixteen), so there’s obviously a conflict with the custom theme code, but I can’t seem to pinpoint it. Perhaps you could help shed some light?

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