Exercise minutes and calories not recording correctly

See the "Make sure that you earn Move and Exercise credit" section in:

Get the most accurate measurements using your Apple Watch - Apple Support

You should also make sure your watch is calibrated:

Calibrating your Apple Watch for improved Workout and Activity accuracy - Apple Support

Also, see the solution to:

apple watch series 5 activity recording n… - Apple Community

If all those seem OK, then the first (and simplest) thing to try if something isn’t working right is to restart your Apple Watch and its paired iPhone. If necessary (device not responding), try a forced restart. Both methods can be found here:

How to restart your Apple Watch - Apple Support

Restart your iPhone - Apple Support

If that doesn't help, the next steps would be to unpair and pair your watch again and restore from the backup just created. This should result in no loss of data. It deletes all temp and corrupted files and re-indexes the file system.

Unpair and erase your Apple Watch - Apple Support

Set up your Apple Watch - Apple Support

I have similar experience with Garmin connect showing burned calories for an hour workout as 900+ and active "move" calories are only 400+. the activity "move" ring calories are not reflecting active calories are passed from Garmin connect and shown in Apple health app as active calories. How can active calories be counted in one spot in health and not the other?