Workout disappearing from Activity app later in the day

Hi, I have an IPhone 14 Pro Max running IOS 16.2 and Apple Watch 4 running watchIOS 9.3. I’ve recently noticed in the last few weeks that I will work out in the morning and my activity counter on my watch and phone show the calories from the workout… but at some point in the afternoon those calories disappear.

for example today I worked out for an hour on the stair master from 7-8 am, burning 726 calories, and it’s logged in my activity app. My active calories showed in the 900’s on my watch until about 4pm and then all of a sudden most of my active calories disappeared and my total active calories dropped to 420 something. The workout is still showing in the activity app summary, but if you look in the health data for the time period I was working out, it’s no longer showing I was doing anything during that time period. I tried unpairing the watch and repairing it…recalibrating my fitness information… made sure all of the correct buttons in privacy on the watch app and in my settings are on.

i can’t figure out why it’s just disappearing.

a few screenshots. First is my workout from 7-8am. Second is later in the day when it’s saying I only burned 59 calories in that time period, not 726. Last is where it shows my total active calories today are only 446, but literally right below shows a 726 calorie workout.

HELP 🥵