Steps don’t appear to be accurate

I’ve recently bought a steel hr sport and the Steps are about 2000 less than my other counters. I have two other counters which are quite similar. I had done about 1500 steps at home but by the time I had got home, my other counters were about 2000 steps more than the withings - I’ve disassociated the watch, deleted the app and reinstalled it and recalibrated the time; still struggling. any ideas? I’m so disappointed