Thank you, Yumyumpoppycat!
It's lovely to read all of your stories and progress and to feel that I'm not alone in this.
To this pp who was asking, I also have unreliable Salter scales. The first time I step on I get a reading a pound or two heavier than the reality, then the second time I step on seems to get 'locked in'. No matter how I step on them after that, weight not fully on, weight fully on etc, the weight stays the same to the 0.25 degree. I also have Korona ones, which seem much higher tech and more accurate.