Any Physicists Out There?

Oh said it is the springiness of the carpet pile pushing upwards which add to the weight difference.

I have found the same. However, unless the scales have been calibrated, it merely serves to tell you whether your weight is rising or falling. Unfortunately mine are displaying the reluctance of a month's worth of croissants and pain au raisins whilst in France to dissipate despite my abstemious regime since returning home. It does not augur well for my next trip away and the occasional full English.

Fulcrums-the carpet supports the base of the scales which in turn stops the internal base bending followed by the measuring system impeding the system set up. I’m no physicist but I’ve come across the question before. It defies our logic but as a cop out-‘that’s Physics’🤷🏻‍♂️
If in doubt Google it👍🏻😊