The surveys of Kono Manga ga Sugoi haven't been conducted only among the professionals till now. There were several independent surveys, one of them among the famous people (musicians, actors, fashion models, TV personalities, writers, editors, etc), although the bookstore employees had the great influence on the results. So, either the publisher has changed its method or this is just a small mistake.
Whatever... I am waiting for my copy to arrive. This mook (magazine + book) is a good source of information on the current titles. And this is the first time they have included the list of magazines.
But the first place still puzzles me...