Popular posts widget not loading on mobile only

The popular posts plugin is working great on desktop. It’s displaying with thumbnails in a nice format, and seems to be tracking my views nicely.

However, it won’t load at all on a mobile view. The “Popular Posts” heading is there, but underneath is just a continuously loading bar that never finishes. This happens on the home page and on any post page, but only on mobile. Any ideas what is causing this? I don’t have lazy load on.

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