Inaccuracies in the app, specifically steps and calories from walk

[SusanHD]

What's this fresh ridiculousness? This morning I tracked a walk in the app, and it has tracked the route on the app map perfectly, and the distance looks about right, but the calories and steps are completely wrong. For the following several hours, more steps are shown than should be when I was at my desk. Overall I think my step count is about right but the calories are nonsense for the day, and the app reports I have eaten more than my allowance. With a nearly 3 mile walk to start the day I should be below target at the moment.

Moderator edit: clarified subject... And made it so general no one scanning the posts would ever know what it was about because "inaccuracies in the app" could cover pretty much every metric these days. 

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Yesterday's walk I didn't bother with tracking. It appeared in the app starting about an hour late. Today's I tracked and it shows the right time, the right steps and about half the calories the same walk used to show. This really could be the nail in the Fitbit coffin for me.

Moderator edit: clarified subject.

[SusanHD]

Tracked again this morning, here is this morning's walk, compared to the same walk from a couple of months ago. Then it was 454 calories, today, 194.