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Body Battery appears/disappears on the same graph and make an incorrect calculation

Always the same problem:

I wear the 5X Plus for a walk and the body battery line on the stress graph magically disappears.

As soon as I wear the  First Avenger/vivoactive4 the body battery line becomes active again, however with a clearly incorrect calculation.

As the BB is calculated on the stress line. Why can't I see it when I'm wearing the 5X Plus ?!