Strange box when viewing site and hovering over some menu items

Hi,
on the following site - www.cityanddocklands.com - when viewing using Microsoft Edge and hovering over some menu items (Home, Current Developments & Contact Us), a grey box appears above the menu item. It is consistent on any machine.

I can't find any differences in page layouts etc., and was hoping you could point me in the right direction to cure this.

Thanks.

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