Hi Kaoru,
first of all, thank you for the purchase!
I have installed the plugin you are using on the Kabuki demo website, and created an events page to test it – the menu works fine there at the moment. The first thing you can try is to update the theme to version 1.1 (from the Downloads tab in your ThemeForest account, by the way it contains a couple of important fixes, such as improved Internet Explorer compatibility). If this does not help, please send my your admin login and password to support@satoristudio.net (no disclosure guaranteed) – there are so many potential causes of this issue that it would be long a cumbersome to try to ask you all possible questions :) it’d be much more efficient if I could take a look at the code myself.
By the way, I’ve noticed that the submenu on your website looks a bit wiggly – you could try adding the following line of code to the “style.css” file (Appearance -> Editor admin menu):
#nav-primary ul li ul.sub-menu, #nav-primary ul li ul.sub-menu li { height: 47px !important; }
This will make the submenu look more like the Kabuki demo ;) sorry in advance if the current state of the menu is what you want it to be.
Sincerely,
Andrew | Satori