So this field is displaying one of the parameters that can be chosen in Coach page editor. Here's a working example from live site: hidden link (I'll include screenshots to illustrate).
It's supposed to work in a similar way as image as far as I understand.
Thanks for the explanation. It helped me understand the issue. In the staging site, you didn't select this taxonomy. (Kindly check the attached screenshot 1)
After selecting it, it appears on the frontend. Kindly check the coach single page. (hidden link)
The "Loading" string is part of your template, so you can delete it if it's not needed. (Kindly check the attached screenshot 2)