iOS 11 Activity APP Flights Climbed inaccuracy

I climb sixty flights of fifteen steps each morning, but the count at the end of the activity varies between seven and twelve. Does anyone know if there is a fix for the problem? In previous iterations of iOS the count was inaccurate as well, but it was usually short by only five or six steps. To make matters worse, it has become more difficult to add the omitted flights manually or to edit the total.