You might want a surveyor's opinion. If the door (presumably to the forward cabin?) isn't closing, it might have been rehung incorrectely, but why would it have been rehung at all?
It is also common for boats with problems to "warp" and then doors don't close. Could be the chainplates were part of the problem, shrouds too tight or loose, stays too tight, boat not on stands properly, mast step shifted or repaired...it is very possible that the door won't close properly because something has shifted. Whether that's important, or correctable, or a dealbreaker, is something you probably should get a professional opinion on.
Overall though, Sabre is a top line boat.