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Your fitbit tracks floors by measuring changes in air pressure through a small hole in the back of the fitbit. If this hole becomes blocked then it can cause this problem.
Try cleaning it with, for example, an old toothbrush or a can of compressed air. Don't poke anything into the hole though as this can cause more problems.
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Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
Have a look at the following thread. It has a picture showing where the hole is:
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