Hey Punisher28,
indeed, it was a bug in the theme – rooted in a wrong CSS “position:fixed” declaration on the submenus. I’ve fixed the CSS and made some changes to the jQuery as well so that submenus behave as intended. Please download this archive from my repository, unzip it, and upload the two contained files into the theme folder (i.e. /wp-content/themes/Tokyo). Thank you very much for pointing this out, I will also update the ThemeForest item, of course.
Let me know if the fix works!
Sincerely,
Andrew / Satori Studio