Display buffer related bugs seems like the most likely reason.
this post was submitted on 15 Dec 2024
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Fractional scaling of your display?
The larger monitor is at 75%, the smaller laptop builtin is at 100%. I rebooted and now I am able to run Display Configuration again.
Well, my 2nd monitor was better served in another location (allowed me to move that monitor to my AppleIIc+ for a color display vs. the green screen 9") so now that I am back on only the internal monitor for the laptop and that is 100% I should not see the ghost lines any more.