When you add a product to a several categories, hickashop must generate product url as this product is in this category.
Also you can include a lot of categories to a product. For example you have a product Porshe 911 and you have Categories
Sport Car, Car, Porshe, Rich Car. You can inculde this product into all of this categories and you have a special list in product's backend to do this. For example you added categories in such order Sport Car, Car, Porshe, Rich Car.
Now after update = url is not generated in product listing it redirects product always to myweb/sport-car/product/porshe-911
If you will change order of categories in product backend Rich Car, Sport Car, Car, Porshe.
It will allaways redirect to Rich Car//Porshe 911
This is breake user navigation cos if you navigate Sport cars and opened link to a Porsh 911
you will redirect to a Rich Car//Porshe 911 but it have to stayed in Sport cars/Porchs 911
Open this URL
aketo.kz/ustrojstva-plavnogo-puska/560-kvt
you will see 3 products. Try to open any of this product and look at breadcrumbs befor and after you open any of product.