problem with menù

Hello

I am testing a site with corporate template; sometimes happens that submenu items are visible and fixed (without mouseover on menù item). If you go over with mouse items starts blinking. I thought this was because a conflict with third party components but I notice it happens even in your demo at
demo.hotjoomlatemplates.com/corporate/in...ensions/hot-slicebox .

Thankyou for help.

Milo