I'd guess that the sensors aren't being linked to the
environments/environment_1/air_temperature/measured topic for whatever reason and that is what's causing the UI to not display the temperature.
Or, if your
api node is dead (test this by going to
IP:5984/_openag/api/0.0.1/topic) that should also not work.
There are other things that come to mind but it's awesome that you're getting everything working!