Description of the problem:
There are two problems that I found with the dropdown feature when searching for a name in the Address Book. First, it refuses to disappear when clicked away from. The only way I could manage to get it to go away was to reload or go to a different page. Second, there are a couple of names that show up which don't seem to correspond to an actual account, for example, "Aa aa". I'm guessing these are people still in the process of registration, but I get the feeling that if their accounts aren't able to be seen by the rest of the community, their names shouldn't either.

Screenshot:

Reducio

Device and browser used:
Google Chrome, Macbook