Is this a 2013 MBP or a 2012 MBP? The 13" 2013 MBP seems to just have 2.3 mm and 3 mm screws according to ifixit. The 2012 model does have 14.4 mm screws, and 3.5 mm screws and shouldered 3.5 mm screws:
Best thing is to loosen all the screws again and drive the problematical screw in snug, but don't really tighten it. Then snug all the others and then go around and tighten them all. It sounds like it may be binding and you may just need to fiddle with it a little more.
Good luck!