The hinges wear out with time and age, and the door sags. When they get rebuilt/restored AFTER paint, be it original or recent paint, repainting the restored hinges the body color is a step painful to complete.
Your paint looks gorgeous, and I'm guessing it's not the original paint. And it looks like the hinges were serviced AFTER the last paint job.
It doesn't really show, and it's not a big deal, unless you're restoring a 100-point show car.
If your paint color matches a factory color, you may be able to remove those guys, and paint them using a rattle can touch paint of the same color, and reinstall them for a better look.