Innacurate weight

I received my Wyze Scale a couple of days ago, and it consistently reads 3 to 4 pound less than my other scale which has shown to match the results of the scale in my doctor’s office.

My BMI is lower also on the Wyze Scale.

The scale is on a flat, hard surface, and I have calibrated it to zero.

Should I expect that I will always receive inaccurate results, or is my scale defective?