You've actually answered your own question, kinda, sorta.  The only time I have had those double-tones is when I'm running a beta version, once something goes to the release candidate or actual release version those disappear.

I have to believe this is an intentional design element so that one knows that a beta is in use.
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Brian - Windows 10 Pro, 64-Bit, Version 20H2, Build 19042  

The depths of denial one can be pushed to by outside forces of disapproval can make you not even recognize yourself to yourself.

       ~ Brian Vogel