Footer moves

Hi

I’m using Enfold with a sidebar menu on this website: http://test.amelieke.com. I made the sidebar menu sticky, but also i want the entire footer to show. So i gave the footer a higher z-index. Now the strange thing is that on some pages the footer is moved to the right: http://test.amelieke.com/zang/, and on other pages it is shown correctly, covering the entire width of the page. http://test.amelieke.com/zangles/ What am i doing wrong?

regards amelieke