I lost the “/” bar to get to categories

Hi to all,

This is Eudald from Catalonia. I am having some problemes with my worpdress. When I try to get all post from a concrete category, in the URL the “/” is lost, so the url it fails. For example, my domain is “https://www.recordant.cat“, when I want to go to category “actualitat“, I get this URL “https://recordant.catcategory/actualitat/”, and it is a broken link.
Is there anyway to solve this?

Thanks a lot for your help!