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Which Fitbit tracker are you using? I'm surprised you would get an accurate step count by using it on your ankle, which isn't the recommended way to wear any Fitbit AFAIK. How do you know the data reported by your treadmill is accurate in the first place? Maybe by wearing your Fitbit in a non-recommended way, you just matched the inaccuracy of your treadmill...
Dominique | Finland
Ionic, Aria, Flyer, TrendWeight | Windows 7, OS X 10.13.5 | Motorola Moto G6 (Android 9), iPad Air (iOS 12.4.4)
Take a look at the Fitbit help site for further assistance and information.
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