Can
(@candanbl0g)
Firstly, the layout don’t change when you zoom in to the page. You can use http://quirktools.com/screenfly/ in order to test your layout with different screen sizes.
Secondly, the expansion effect is done by using JQuery and your problem is probably about it. I don’t have enough information to help you about JQuery, but be advised.
Watch this: https://www.youtube.com/watch?v=EGbCs5Gn3cg&feature=youtu.be
You can change the layout making zoom in the page.
Listo, al fin logré solucionar mi problema todo era un conflicto con este Plugin: http://wordpress.org/plugins/spoiler-block/