Calibration affects the reproduction of HUES on a monitor,
but does not correct inherent BRIGHTNESS. On my monitor, your image originally posted appeared a bit dark...the sky was lower in intensity than I would ordinarily expect. So I screen grabbed the photo, imported it to adjust exposure, and compare the two side by side.
The surrounding area of Lightroom, seen around the two shots, is midtone grey.
You should be able to see the full range of brightness and 26 distinct steps in the below range, when the Brightness and the Contrast of your monitor are properly adjusted (...and
then do monitor calibration for Hue reproduction accuracy)
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