New City Listing

I have a question about the section titled "Your Friends". Only part of my Friends list is in alphabetical order. At the end of the part that is in alphabetical order then it is a mixture of Friends not in alphabetical order. Is there a reason for this? And last night talking with a friend and she asked me if I could see her City on the list and I checked twice and could not find it and today her City is there. This is very confusing.