For some time (after last update?) the floors climbed feature is broken in my 955. I cleaned barometer. I calibrate the Barometric Altimeter (and compas) few times . Restarted watch few times (it helped in the past when the same problem occurred). Altimeter and barometer graphs in ABC widget are looking fine.
This week I was mainly sitting at work. Some times I am siting and writing on the keyboard and I am gaining floors. I think I should be getting around 20 floors per day. It seams that the problem is not affecting floors down stat, only floors up.
It looks like software problem to me.