Inaccurate calorie counting after workout done

I found the halfway solution. Go to the Health App, Active Energy/Data Sources & Access/ Tab Sharing/ Apps/ Find the other apps besides your Apple Watch and remove their write access. You can still keep them reading your data, but I couldn't find a way to say which one should have write access, and changing their write access didn't help either. So by removing write access from other apps, the only one that can write will be Apple Watch! Hope this helps

Did you check the settings for your Health Details in the Fitness App on your iPhone?

Tap on the account picture in the right above corner -> Health Details -> Height, Weight ...

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

Are you using a 3rd party app for your workouts?

Is any other 3rd party app sharing your Health Details with the Health app?

Is your Apple Watch on top of the list of Data Sources in Health App ->Browse -> Activity -> Active Energy -> Data Sources & Access?

Also yesterday my active calories burned was 448 after my workout was done. At night before going to bed it dropped to 339

and today it dropped to 313!!!!

I’m wondering why it keeps changing for yesterday calories burned. To me it is a malfunction on the software

Yes, it’s all updated and it was working fine. This is a new behavior that I hear others are reporting too. I checked even the data source and other apps. I saw your response last year and followed that too and didn’t see anything that needed to be changed. The watch for example shows 450 calories burned and half an hour later it reduced it to 330.

I saw the solution you posted earlier. I do use some apps, but in Data Source & Access, my Apple Watch is the first source with higher access, and nothing has changed in my app settings. I was always using the same apps, and this is new.