Welcome to the Fitbit Community @Ujjwal_2606! As you may know my friend, your Charge 2 uses both the accelerometer and the altimeter to track floors. Algorithms interpret the raw data into a floor. It registers a floor when it detects continuous motion combined with an elevation gain of about 10 feet.
Said that, here are some of the possible causes for this inaccuracy:
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The tracker may track floors while driving, on an elevator or in an escalator
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Due to the Charge 2 is a wristband tracker, it may track floors while opening doors, from a weather change, or from a gust of wind (i.e. pressure changes)
Occasionally your tracker may detect pressure changes unrelated to elevation gains, such as a gust of wind, weather change, or opening a door. Exposure to excess moisture can also result in extra floors being counted. This happens if the pathway to the altimeter on the back of your tracker becomes temporarily blocked with sweat or water. I recommend that your tracker be worn loosely during exercise.
I haven't experienced this before, I'd recommend checking what I posted above to see if something listed there is causing the discrepancy.
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