Charge 3 stats are being doubled

[TeaUser]

The Charge 3 randomly doubles the readings. For example, 11000 steps will show on the screen as 22000. I have observed this with the step count and the heart rate. When I synchronize the Fitbit with my Windows 10 computer, the readings return to what they should be.

This has now happened with two Charge 3 devices. I returned the first, because the malfunction happened frequently within the first week of owning it. Today marks the first time I have observed this with the second device, which I have been using for about 3 weeks. If the history of the first device is any indication, the problem will grow worse over the next several days.

My device is up-to-date. Are the cause and fix known?

Moderator edit: subject for clarity

[AlejandraFitbit]

Welcome to the Community, @TeaUser.

Are you manually logging any type of activity that might be doubling your information? If you are, I recommend deleting those activities and see if your information goes back to normal.

I hope to hear from you soon. 🙂

[TeaUser]

Hello Alejandra,
I rarely log any activity manually, and did not on this day. The doubling does not just affect steps and distance when it happens. I returned a Charge 3 because this behavior was happening frequently (off-and-on during the same day, almost daily). 
This also affects heart rate. On the fitbit that I returned, I observed several instances when I was standing still, and my recorded heart rate jumped from, say, 70 bpm to 140 bpm. My heart definitely was not beating at 140 bpm.
Yesterday, I noticed the steps sometime after the doubling had occurred, so I didn't see whether the heart rate was also doubled during the event. 
Thank you for looking into this.
Theresa

[AlejandraFitbit]

Thanks for the update and the information, @TeaUser. I am sorry to hear that you returned the unit. If in the future, there is anything we can help you with, do not hesitate to post it.

Happy stepping. 

[ElevatedPlains]

Thanks for logging this issue as it just happened to me and I had no idea what was going on.  I saw your summary and as you say, it fixed itself once I synchronised with Windows 10 which had the correct info on it the whole time.  I have had my device for 3 months and just love it.  I hope this is not a bad omen!