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https://postimg.cc/n9nZGLmb

Goodness of Fit 0.911, Kurtosis -0.849, Skewness: 0.073

It's very much a bell curve

Just because it's approximated by a bell curve doesn't make it a bell curve. There are quite obvious separate phenomena shaping the curve at different times.
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Those graphs look nothing alike, except for "going up and then vaguely going down."
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