Nginx Reverse Proxy - Infinite Redirect

My service health looks like this:

OK KPI

Mongo: OK in 0.026 seconds
Postgres: OK in 0.0134 seconds
Enketo [http://ee.wsbeng.internal]: OK in 1.15 seconds
KoBoCAT [http://kc.wsbeng.internal]: OK in 1.52 seconds

----BEGIN KOBOCAT RESPONSE----
OK

Mongo: OK in 0.0165 seconds
Postgres: OK in 0.0111 seconds

---- END KOBOCAT RESPONSE ----

Everything appears okay, no? I still have no action when clicking the open button though. There aren’t any errors in the console, and I haven’t seen any network errors.