Mak- step tracker use accelerometer and gyroscope sensors… while using device if it move in certain angles and distance it will count it as steps…
step trackers is not always accurate unless and until you put your device in your lower pocket or strap it on your shoulder…
I do 10km walk everyday… when i have my phone in my pocket, data is somewhat accurate…but when i have it my hand /using…it always miss/add steps…