Footer not shown correctly

Hey there I am using the theme "Catch Fullscreen Pro" and it all looks and works just awsome. There is one problem with the footer though: Depending on the width of the browser the footer is shown only partly or not at all even. Scrolling up and down after resizing the window sometimes even changes the part that can be seen. Please check it out to see what I mean: http://5702711596392.hostingkunde.de Any ideas?