i have the fitbit Blaze. About a month ago it began adding current days steps, calories, floors, and miles to previous days. It resets at midnight and then sometime between noon and wpm it will vibrate saying I've reach my goal steps and then will add on the previous day's steps, etc. It is making me crazy. Resetting and restarting do not help. Sometimes it helps if it does and then i charge it but not always. It is syncing fine, Everton is showing up on my phone exactly the way it is on my fitbit. My timezone is correct and i have not traveled across timezones in over a year. I clean it regularly and don't sleep wearing it.
