Watch reverting to kj- all settings are cal

My Apple Watch 7 keeps reverting to kjs on the display screen, all my settings are cals. I’ve looked through online forums and checked that my Health and Watch settings are cals, I’ve changed them to kjs and back, restarted the watch and my phone, changed the watch face display, and nothing is working. My exercises are captured in cals, it’s only the watch display that’s kjs.

It’s happened 5 times in the 18 months I’ve had the watch, seemingly if it’s own accord. Please help! I might revert to Garmin, it’s very frustrating.