Door too low on striker

Why is it wrong. I need to adjust my passenger door and that was my plan
Different methods for different people. When I get close I adjust the striker so the door looks good and where it's supposed to be, and then go again on the adjustment if necessary so the door is not hanging up on the striker as it opens and closes. If you've ever had the nut fall out the back and had to go fishing you kind of quit pulling them all the way out unless necessary.