Menu does not appear expanded to show menu items.

I have created a menu titled "Shop", of the Menu type hikashop_default and I have created 2 menu items of the HikaShop » Categories listing menuItem type, along with a 3rd preexisting menu item "Product listing" that I activated / published.
Although the menu works fine and links correctly to every category and digging deeper to every product correctly, the user needs to click and expand the menu for the menu items to appear ( I would like for it to appear expanded and show all menu items by default).

If I understood correctly from previous similar questions in the forum, from the ModuleManager I have activated the option to Show Sub-menu Items for the module associated with the menu (start and end level values go from 1 to all so they seem non exclusive and logical as well) and from advanced option I have disabled Caching

Somewhere along the forum I think I 've located an explanation that Joomla and not Hikashop must be the culprit and so I have applied the proposed solution of no caching in the Global Configurations of the Joomla back end, still to no avail. Menu still needs to be clicked on for the menu items to appear.
I include some attachments in case they clarify things a bit and I am open to any suggestions

-- HikaShop version -- : 2.2.0
-- Joomla version -- : 2.5.14
-- PHP version -- : 5.4.16
-- Browser(s) name and version -- : tests in Firefox 23.0, Opera 15.0, IE 9.0.812