Evo Template Sub Header Mobile Bug

On a desktop, the submenu floats at the top of the screen when a user scrolls downward.  On mobile, it is static and doesn't float. Is this a bug?  Or does anyone know how to make it float on mobile as well?

Tested on demo site and same issue. Used safari on an iPhone. 

Same here. Hope it will be fixed soon. 

By the way, on desktop browsers there is a bug too. When you scroll up or down, yes, the submenu bar floats, BUT NOT THE SUBMENU ITEMS.