Weird posts order into bubbles

Hi all: i'd like to know how to change the order in which the posts are showed into infobubbles. If you look at my website: http://wikiroma.it you will see that the order in which post are showed into location bubbles is wrong: it start descending, then becomes ascending. For example if i've published 10 post for a location , where 10 is the number of the newer post, the order is: 5,4,3,2,1,6,7,8,9,10