modules display under my shopingcar

-- HikaShop version -- : essentials

I have a question because the way my shop is setup: I can't figure the following out:
www.stipmedia.nl/index.php/nl/webshop
My joomla Template layout: has a placeholder with the hikashop module:

This exist under a menu item webshop.
when clicked in the front end it goes to webshop page (hikashop).

When I buy a product (see file) in the shopping cart step:
The categorie menu is showed on the left
The little shopping cart is shown on the right.
The other modules Which I don't want to have in this shopping cart step.

Where did I go wrong and how can I solve this?
I only want to have the shopping cart and not the modules below the shopping cart
if you need more info I can understand don't hasitate to ask

Thanks ronald

Thank you nicolas
I was digging in php files so I continues to look for this in the php files. you saved the day