03-17-2016 08:22
03-17-2016 08:22
03-17-2016 09:26
03-17-2016 09:26
Any change in the way you walked, such as having hands in pockets if it was a cold day?
Is it otherwise tracking steps OK? If it seems to be missing steps more generally then you could try a restart:
http://help.fitbit.com/articles/en_US/Help_article/How-do-I-restart-my-tracker/
This does no harm and can sort out all sorts of issues.