mega menu appears when the cursor is on hidden area

Hello,
I really love this plugin but I’ve found a weird fault when I hover over the area where the mega menu area should appear it makes the mega menu appear but i only need it to do this when the user hovers over the navigation menu title that is associated with the mega menu.

site is at : http://staging-climavent.wearecreativeweb.co.uk/

thanks in advanced for the help