Thanks for reaching out. That topic can be confusing, and I’ll need a little more information & let me see if I can clarify that for you.
Could you please share the version of Lightroom Classic from Help > About Lightroom Classic? Have you opened these images after a long time? Is your monitor color calibrated? Have you tried any troubleshooting steps?
Try the following suggestions and let us know if it works.
Select a range of images.
In the Library module > On top menu > Library > Preview > Build 1:1 previews