Seems like it may be an issue with the screen if you've gotten the same results with different phones / screens. Assuming no frame damage at all (small inconsistencies on the frame can definitely cause a fit issue). I've had OEM screens fit strangely because of a very small piece of the water resistant adhesive used on the 7. Also, Sounds like something could be off with the frame on this one though .
"When you open the phone place a little piece of tape or make a mark on the metal plate in line with the ic on the original screen when ur placing the plate on the new screen make sure the ribbons and the ic line up with that mark :) simple remove the mark or the tape after
Also when u take the plate try to lift it from the bottom not the top so it doesn't bend or warp where it's stuck down that way the plate is straight and doesn't have bends and kinks in it I use heat to loosen the adhesive then a flat tool to pry it apart not damaging the original screen flexes or the plate itself :)"
I have noticed that when you assemble the iPhone without the metal that holds the cables in place the screen fits well. When you install the metal the problem appears again.
"My 6s plus reassembled nicely except for the bottom. There is a pretty wide space between screen and frame below the home button. It cannot be forced closed. It’s a hard obstruction. Looks like the home button cover sits on top of the charger port housing. The HB plate appears too thick but it’s original. I replaced the screen, moved the HB and cover bracket over to the new screen.
Could the two mounting bosses be too high? Button feels perfect.
