How is 'Weight' calculated? It appears that most of my weights are a direct relationship to the amount e.g. an amount of 95.0211231 has a weight of 950 (so 10 times the amount). But then I have an amount of 112.270821 that has a weight of 892 (8 times).

The number of confirms doesn't 'seem' to have any influence. I have stones that have in excess of 2100 confirms with zero weight.