My screen door seems like the hinge end hits home before the latch end, resulting in some flex of the hinge. I am expecting that it will break some time in the future.
That may be what is going on with your screen.
I don't know if you will be able to replace just the screen door hinge. If you can it looks like a pop rivet gun and a drill will be needed.
Give Heartland Customer Service a call and maybe they will have a method of replacement.
Or at least they may be able to tell you who made the door. That will give you another contact for information.
Heartland Customer Service
877-262-8032 / 574-262-8030
Peace
Dave