If you don't use too much subcategories like:
domain/pt/movies/actions/other-category/another-category
you can say "Only lat one" for "Add category to URL" and "Add category to item" on AceSEF=>Extensions=>K2=>URL. And after you generate URLs, go to AceSEF=>URLs and change menu links, for example:
domain/pt/movies/movies to domain/pt/movies
Actually, I just saw on your website that these duplicated URLs appear because of Itemid. Some links do not have Itemid, some have a bad Itemid like "Itemid=", and some have the right Itemid. So, I think that the right solution is to say Yes for "Use Smart ItemID" on "AceSEF=>Extensions=>K2=>URL". And then each link will have the right "Itemid".
Also read these pages carefully:
www.joomace.net/support/docs/acesef/how-...vent-duplicated-urls
www.joomace.net/support/docs/acesef/how-...-by-multiple-itemids