Doesn’t make sense.
Try weighing known weights. Do you have weightlifting weights? Do you have a 20 liter bucket you can fill with water? Using known standard weights can definitely rule the scale in or out as a problem.
Use ceramic tile floor with all contact points of the scale in firm contact with the floor. In other words, not rocking, tipping or wobbling.
Good luck with the water loss. Please post your progress here.
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