Alta step count inaccurate

[AGAlta]

For some weeks my Alta has been showing a vastly inflated step count whenever I access the app on my Samsung Galaxy S8. Even if I've only turned the display off it will show several thousand more steps than I've done when I turn the display on again. Syncing it sorts it out, but I sometimes have to sync it several times before it gives an accurate step count, and the next time I look at it's back to the inflated count again.

I thought at first that it was adding the day's steps to the previous day's, but that doesn't seem to be the case as the count is sometimes lower that the previous day's total.  Restarting the phone and the Alta makes no difference.

Has anyone else experienced this, or has any suggestions for sorting it out?

Thanks in advance for any help.

Moderator Edit: Clarified subject

[AlejandraFitbit]

It's great to see you around, @AGAlta.

Thanks for troubleshooting this steps issue. For tips about improving accuracy, I recommend checking the help article: How accurate are Fitbit devices?.

Several things can affect the number of steps your Fitbit device records, including where you place the device, if you wear it on your dominant or non-dominant hand, and your stride length. If you're pushing a stroller or shopping cart, try putting your device in your pocket or use GPS to record your activity, if possible.

If it still seems like your device is undercounting or overcounting steps, try a step test. While you perform your step test, make sure you:

-Walk at a normal pace

-Don’t hold anything in your hands

-Put your arms down at your sides, swinging naturally

-Count 1 step for each foot

-To avoid getting an additional step when you bring your feet together, after you reach 100 steps:

1. Freeze in a split-stance. 
2. Move your hand up gently to check the step count on your device.  

Here’s the step test:

1. Restart your Fitbit device. For instructions, check the help article: How do I restart my Fitbit device?.
2. Put your device on your wrist.
3. Walk 100 steps, making sure to count a step each time one of your feet touches the ground.
4. Pause, then check your device to see your step count, and write down the number of steps you took and the number of steps your device counted. 
5. Perform the test 2 more times, walking 100 steps 3 different times. Each time, write down the number of steps you took and the number your device counted. 
6. Add the number of steps over or under that your device counted for all 3 tests. If your device counted 30 more or 30 fewer than the 300 steps you took, please let us know.

Let me know the outcome.