Is the Update Cart option now showing up? I tried to check the link you provided before but it was not available.
It is possible that the theme you are using include some coding that conflicts with our code or the CSS of the theme is causing aspects of our cart not to show up.
Also, when I copy and pasted the code from your site and placed it in my previous posting it did look different. Not sure why it changed, but I am sorry for any confusion.