There are many reasons for doors not shutting correctly. Loose hinges, frames not connected to anything, pivot hinges wearing out. Today I encountered one that was heretofore alien to me: negligent installation. There were maybe 30 holes on this continuous hinge and the people who installed it only tapped and installed about six or seven screws, and those not very well. As a result of installing about 20% of the screws the door was sagging and the frame was bent. What screws were actually installed had been driven in at a jaunty angle so that the heads were sticking out and would prevent the door from shutting all the way.
When I saw this I told the building superintendent that this was installer negligence and they should call whoever installed it to fix it for free. The building owner came over and told them that it was normal to only install a handful of screws and to prevent this from happening one should put threadlocker on the screws! That’s the biggest load of malarkey I’ve heard in weeks and I listen to NPR every day.
Continuous hinges are an amazing development and they can last for decades, but only if they are installed correctly. I can’t imagine who would half-ass a continuous hinge installation and if they were going to why they wouldn’t screw in the top ten highest hinge screws. Maybe they forgot their ladder?