I've had a feeling that mine aren't accurate, so I've been testing them a bit. Today they have fluctuated between telling me I'm 11stone 1 to 13 stone 5! I've been hopping on and off and getting different readings, so I'm certain it's not just daily weight fluctuations.
I like to weigh daily, then put the results into an app that smoothes out the trend, but it's getting ridiculous,
(FWIW, I'm trying to go from 13 stone 11 to under 10 stones, so these fluctuations are not helpful!)