Hi,
From what I see, the problem is that what you have at the top is a module.
In the "force a menu on checkout" setting of the HikaShop configuration select a HikaShop checkout menu item (you might first want to create such menu item via the Joomla menu manager if you don't have one already) and then edit the module that displays the products at the top and in the menu assignment tab of the module, make sure that this menu item of the checkout is unchecked and that should fix the problem.
If not, please provide a link to the page.