@HrvojeZ Welcome to the Fitbit Community! It's great to have you here!
Let me help you with your Flex 2 counting steps while in the car. Your device will detect the movement on your arm and translate that movement into steps. There are situations in which your arm may move but you won't be actually walking. For example, this may happen when you are playing the drums, burping a baby or clapping. It can also happen while driving. You can negate these steps by logging a driving activity. You can try wearing your device on your non dominant hand but select that hand as dominant on the device’s settings to make it less sensitive to movement.
Let me know how it goes.
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