The two iPhones are set up identically with different users. They are both device_trackers
Both Eva and I was at the same place at the same time, thus in the same zones at the same time.
Still the history graph shows Eva as in the zone, then “Away” (Borte) and back in the zone at the same time I am reported to be in the zone all the time (as also Eva was, physically).
What could the reasons be for the different zone histories?