Mapbox.js not displaying a certain UTFGrid variable

I'm working on embedding a Mapbox map on a site but interactivity doesn't seem to be pulling in one of the variables properly.

When you view the map on Mapbox's site, it shows the values that it is meant to without issues.

After embedding the map here however, it only shows the title that I've defined but not the number value underneath. The strange part is that the embed works in JSfiddle and it worked once on my site for a little bit but it quickly disappeared for some reason. I can't seem to figure out why.