Try if it helps to deactivate the GPU acceleration in the preferences.
If it helps, make sure your GPU driver is up-to-date and then turn it back on.
Which version of OS and Lightroom?
What is the source of the NEF (camera type)?
What type of GPU is in your system?
Try to disable the GPU. Preferences > Performance > set Use graphics processor to Off.
If this fixes the issue, update for your graphics driver if there's a newer version available, then try to turn the GPU back on.
Another possibility is that you have a defective monitor profile,
Try setting the monitor profile to sRGB (use Adobe RGB if you have a wide gamut monitor). If that fixes the issue, you should ideally calibrate your monitor with a hardware calibrator, which will also create and install a custom monitor profile.
Press the Windows key + R, type colorcpl in the box and press Enter.
Add the sRGB profile, then set it as default.
If neither of these suggestions work, try resetting the preferences.
Note to moderator: Please change this thread to Discussion. This is not a bug.
thanks, added sRGB profile and prbolem fixed 😉