custom field is visible on a product it should not

-- HikaShop version -- : 2.6.0
-- HikaMarket version -- : 1.6.7
-- Joomla version -- : 3.4.5
-- PHP version -- : 5.4
-- Browser(s) name and version -- : Chrome 47
-- Error-message(debug-mod must be tuned on) -- : No error message, but a custom field is visible on a product when it's not part of the category the field is assigned to.

I added a custom field to the item table. (the product entries of an order). That way a vendor can add the amount of cheese (weight) it actually processed after the order is completed.

But when I look at the order where there is cheese as well as another product from another category. That other product also has the custom field available.
However when I created the custom field I told the system it was only for products from the cheese category.

Hikashop
Sorry for the confusion. The link is the correct one.