Twins The stair recorder altimeter on the Fitbit is affected by atmospheric pressure so if your area is stormy or if it is particularly windy, you'll have phantom stair climbing show up.
Yesterday, I did 22 flights according to the system. I actually did about 10. I have at least 1 extra already today.
On the other hand, it seems to only record full flights so when I walk up the 9 stairs from the kitchen to the bedroom, I get no credit. I have to do the 12 from the living room up to the bedroom. The church is also split level (and sloped) so if I go up the front stairs from the basement to the pulpit, I get no flights but if I go from the basement to the back of the sanctuary, I get a flight.