Menu Problem

Hi... I bought the theme for my friend. I am also customizing it for him. Before this, I was using Catch Kathmandu free version and didn't encounter any problem. I have installed the Catch Kathmandu Pro and began live testing... I encountered a problem with the menu. I find that the old menu still appeared even when I am using a custom menu. Is there a way to disable the default menu? Before this, when I activated the custom menu, the custome menu is the only menu that appears on the header. Go to my live testing site to see... http://prozak-nation.com/olaf/en/