Why is the step count on the Xiaomi Smart Band 9 Pro inaccurate?

If the the step count on the Xiaomi Smart Band 9 Pro is inaccurate, showing many steps even though no walking and the step count suddenly increases, here is the reason for your reference:
The Mi Fitness APP supports data fusion from multiple devices. Data from several devices under the same account (including the phone connected to the band, the phone logged into the same account, or other devices like the band or watch connected to the same account) will be merged. If multiple people are using the same account, it could result in inflated step count, calories, and other daily data. It is recommended to use each Xiaomi account by one person only and not share it among multiple persons.
If the step count on the Xiaomi Smart Band 9 Pro is inaccurate, showing no increase even after walking a little, here is the reason for your reference:
To avoid counting steps from slight wrist movements, the algorithm is designed to only count steps when it detects continuous and obvious walking. Therefore, if you only take a few steps or move your wrist slightly, the step count will not increase. It is recommended that you walk a few more steps and check again. We are continuously optimizing the step counting algorithm to improve your experience.