Trueup doesn't work properly with floors climbed

I had a nine floors count on my Vivomove and after a sync I went for a run with my forerunner. After the run - 20 floors on my forerunner. Synced & powered off the forerunner - all data fine. New sync with the vivomove - 11 floors???? I would understand 20 floors (correct count coming from the forerunner) or 9 floors (vivomove probably overwrites as primary device the forerunner count) - but 11??

Has anyone the same effects?