Strange url's

-- url of the page with the problem -- : www.toyscompany.nl
-- HikaShop version -- : 2.5.0
-- Joomla version -- : 3.4.3
-- PHP version -- : 5.5
-- Browser(s) name and version -- : all
-- Error-message(debug-mod must be tuned on) -- : Strange url's

Hi,

Somethimes there are very strange links to products in the categoryview. For instance this:

On this page: www.toyscompany.nl/speelgoed/category/16-v-tech-toet-toet-serie , search for 'V-Tech 3 in 1 Racer met licht en geluid' and have a look at the url.

It's this:
www.toyscompany.nl/index.php?option=com_...Bcategory_pathway=16

It has to be this:
www.toyscompany.nl/speelgoed/product/417...-met-licht-en-geluid

What's going wrong?

Jan