Calorie difference between workout app and move ring.

Occasionally when I use the workout app on my watch, the calorie count is not shown correctly in the move ring. I either get no credit or a smaller number of calories burned. Today I hiked for an hour of a half with a significant elevation gain. The workout app said I had burned 353 calories but the move ring in the activity app showed 147. Has this ever happened to anyone else? I can't find any discussion on this.

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