Apple Watch Fitness does not understand Time?

I use the Apple Fitness with the 3 metrics: Move, Exercise, Stand. I understand that these reflect my activity at the time I look at the watch. But I was then astounded at the following display:

which I got by taking a screenshot of my watch. You can see the time if 5:17, so between 5 and 6, and the Stand bar (at the bottom in blue) shows I have stood during the 5 to 6 hour.

But the Move (red at top) and Exercise (Green in middle) show half-hour marks, not hour marks. And there is a thin vertical line just before "6" (and also for 6 am and 12pm) to show where 6 is. And both Move and Exercise show that I have activity after 6, even tho it is only 5:17. At 5:17, there should not yet be results for 5:30 or 6:00.

Normally I never paid that much attention to the Move and Exercise times, but seeing it as well before 6 but seeing a result after 6 caught my attention.

Does this make any sense?