I am not sure what is happening with your situation, but a workaround for when that happens is to add a copy merged layer at the top of the stack. Select the highest active layer and go Shift Alt Ctrl e (Shift Opt Cmd e). You should be able to flatern and mainttain the look of the image now.
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Thank you for the help. That didn't do it, either.
I did figure it out, though. My problem was that I was making a very large image (36" x 28"), and was viewing it fit to the computer screen size. What I needed to do was view actual pixels and tune up the layer style at that size.
All is well, and I sure learned a lot!
I did consider that, but didn't like to suggest it because it was too oobvious.