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It’s possibly a GPU problem.
Do you have a graphics card such as Nvidia or AMD? Or are you using a built in GPU?
You could try disabling GPU
Go to Edit >> Preferences >> Performance
Set “Use Graphics Processor” to off
If that makes no difference check that your video drivers are up to date from the manufacturer’s site. Or consider downgrading to an earlier driver if necessary.
See this link which is for Premiere Pro but which could also apply to Lightroom.
https://community.adobe.com/t5/premiere-pro/green-lines-preview-a-bug/td-p/11189211
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