To expand on what someone said. You can tell if something is up by looking at how uniform the orange peel is. Yes, these trucks have orange peel and lots of it. If your door area looks different than the other areas then more than likely something is up.
You also mentioned tape lines. You won’t see those in factory paint since the truck is painted (dipped?) all at once.
Now as to what you can do about this? Either fix it yourself ( I wouldn’t recommend) or… ¯\_(ツ)_/¯
You took possession. It’s going to be really difficult to prove that something is up.
As to why I said I wouldn’t “fix” it or paint correct. In order to fix orange peel you need to sand down the clear coat. The clear protects the paint from UV exposure. Take too much off and you risk having the clear fail. When the clear fails you get what you see on 90s Chevys, splotchy paint, areas without paint, discolored paint.
Yes, it will look better for a few years. Hell, it might not even fail. But if it does, you won’t be happy at all. And then good luck selling it.