kilocalories calculation error

Hi all,

from a couples of day there's an error in kilocalories calculation in apple watch ultra and consequence in move ring. For example in a 2 hours walking kilocalories for 9 km was 41 active kcal an 82 total. It's too much low. I've tested on 30' indoor bike with result of 44kcal total. The same workout with garmin heartrate band and hammerhead karoo results a more realistic 182kcal. The hearth data is completely comparable. Othere strangeness is the stand hour. It says 16/12 hours but it's impossible because actual time is 15:36.

Any ideas