Hello,

I have logged into your website and removed the word collectie from the URL. When we remove the collectie then the word “product-category” is displayed. This is the default functionality of WordPress and woocommerce and our theme doesn’t influence it.

You can read the woocommerce documentation for further help:
https://docs.woocommerce.com/document/removing-product-product-category-or-shop-from-the-urls/

Best Regards.