Menu is not working properly

Good morning.
I have installed the plugin and have done all the translations of the pages, footers and headers well.
In Spanish and Catalan
But once I get into the page and I want to change the language within it, only goes well in Catalan.
When I want to change the language to Spanish, it only changes the language of the page I am in and when I want to change the page, it automatically changes all the time to Catalan.

The page I need help with: [log in to see the link]