When I set black point on windows, the image switches between blank and full image, why?

when I set black point using windows, the image switches between blank and full image, why?

I set black point with alt button down while I move sllider. When black
dots show, I stop and back off a bit.  That's the normal result. Normally a
white screen appears until I release the alt key. In my case, sometimes the
screen goes from white to full image. It's not all the time. I view my
power and ram use as I work and it doesn't spike when this happens.  It's
as if the alt key command is not holding.  I've used both alt keys with
same results.
Thanks for responding.  I hope you have some ideas.

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