Thanks for the info! Go to the Edit menu in Lightroom, then Preferences, and select Performance from the left panel of the window. Set Use Graphics Processor to Custom and ensure that the option to Use GPU for Export is unchecked (see the attached screenshot). Once done, relaunch Lightroom and export the image again to check if that makes a difference.
If it helps, try reinstalling the NVIDIA drivers from scratch (preferably the Studio drivers).