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I'm afraid syncing problems seem to happen from time to time for no apparent reason. Fortunately they are normally easy to fix.
I would try restarting your phone and then restarting your fitbit using this procedure:
https://help.fitbit.com/articles/en_US/Help_article/1186/
Give this a few tries as it doesn't always work. If it still won't sync after that then there are some more ideas to try in this help file:
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