Score=DI^2
DI=(Win/Rnd)/(Std/Rnd)*1000

In the below graph, I select some random spread, the DI appears to be normal.
(2.04/261.26)*1000=7.81
normal DI?including negative counts.jpg

In the below graph, I select the same spread but back count from TC 3, the DI turns out to be 7.83, while the calculation turns out to be 2.57!? Why is it?
(1.42/551.8)*1000=2.57
abnonamy DI and score.jpg