I have a strange problem with the Jquery plugin Flexslider. When there is a change from one slide to the next (only in the mobile version, viewport <480) all other elements seem to shake. This problem started when I added to the page a script for the mobile responsive menu using Modernizr, but I would not know what the problem is. The test site is http://private2.portalesardegna.com
and this is the reference for the mobile menu script http://coding.smashingmagazine.com/2013/01/15/off-canvas-navigation-for-responsive-website/