Yigit, the link is: http://wijkverenigingbwk.nl
After updating to the latest Enfold version the submenu-items where the same height as the header (146 px) so they filed the whole screen. When I changed the headerheight from fixed 146 px to large the submenus changed to the right height.
greetz from The Netherlands
George, I fixed it by changing the header size from ‘fixed’ to ‘large’ in Theme options -> Header.