Is there something wrong with my scale? How do I get it to give me accurate weight?

Anonymous
I just bought a weight scale today and I stepped on it and it gave me 120.6 pounds. Then I got off of it, came back five minutes later and it said 118.6 pounds. I don't believe that I lost 2 pounds in 5 minutes so is there a way to get an accurate measurement of my weight or is this scale just flawed. It's an electronic scale by the way
Is there something wrong with my scale? How do I get it to give me accurate weight?
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