[Risolto] With products categories

Background of the issue:
I am trying to manage product categories on my WordPress site using WPML. The site I need help with is link nascosto.

Symptoms:
In the Polish language version of a product, I see Slovak categories, and the link to the product does not work.

Questions:
Why do I see Slovak categories in the Polish product?
Why does the link to the product not work in the Polish version?