Hi,
In the settings of your products listing module, under the "HikaShop options" tab, you have a "menu" setting.
In that setting, you can configure the menu item to be used when someone click on the link of a product displayed by that module.
At the moment, either you don't have a menu item configured, or the menu item selected is not accessible / deleted.
Because of that it defaults to the homepage menu item.
The modules you see at the top of the page before the product page details are there because you configured them to be displayed on the homepage menu item, and since Joomla thinks it is still on the homepage menu item when accessing the product details page, it still displays them.
So, what you need to do is to configure a products listing menu item via the joomla menu manager and then, in the "menu" option of your module, select that menu item. Then, make sure that the "menu assignment" of your homepage modules are not configured to be displayed on that new menu item and it will work like you want it to.