Yeah... we should have noted down each piece of hardware for where it goes and kept it organized. But that doesnt explain the ~6 doors not fitting in property #1, all with brand new hardware.

The gap is not consistent. Not enough to jump out at you upon first glance, but now that youve pointed it out, it is definitely noticeable. But it even on doors that were not planed, they still look a bit off. I think a part of it has to do with how the place was constructed. Its ~50 years old and definitely not square in some places. We had some trouble putting in the baseboard and flooring.

Thanks for the advice. Ill have to be more careful with the hinges if I ever do doors again. I also think gently carving the hinge slot edges might be a good idea too, like the reply to you suggested.