Tailgate rubbing rear bumper

[Addison]

I didn't notice it until I went camping this past week, but the edge of my tailgate must be grazing the top of my bumper while it closes, or maybe while I'm driving somehow.

Yes I know everything is filthy... I just came back from camping.
Here's the door:


The bumper w/ door up:


The bumper w/ door down:


I know that I'll have to sand down the rust and repaint the area... but how do i stop this from happening more and more?

P.S... I don't know why the pictures are coming up so huge... They're not hosted that big at all.

[Default User]

(off of tapatalk) it looks like the tailgate has the rust, and the marks on the bumper is just rusty-water run-off.

But I'm on tapatalk and the pics aren't showing it's best

[Noisy Crow]

Did you get tapped from behind, pushing up the bumper? Or is the tailgate shutting too far?