This probably makes sense. The FB One counts steps by movements of your body because it is in your pocket or clipped to your belt. The AW detects steps by arm movement. They are tracking totally different physical movements. The Flex counts by arm movement as well, so those two (FB Flex & AW) methodologies align.The step count on my AW and FitBit One never even close. As of early afternoon, the FitBit is 800 steps ahead of the AW. As the day goes on, the gap will continue to widen. Sometimes, the gap has been 1,500 steps or more. I've done two calibrations with the AW, but they're still not close. My wife's AW and FitBit Flex step counts are usually much closer and sometimes she gets more steps on her AW.