Problem with menu classes, the blog page gets highlited while on custom archive

Hi,
I have a problem in this page:
https://www.enriquearellanofarias.com/test/misarticulos/

This is a custom post type archive page, and it is situated in the menu under “Formación” with a custom link. But as you can see, the “Blog” menu is also getting highlighted, for some reason it is receiving the following classes: menu-item menu-item-type-post_type menu-item-object-page current_page_parent menu-item-321

I thought it might be a problem with the name of the custom post type, it was “articulos”, so just in case, I changed it, but still the same.

I changed the “entries page” from blog to contact, and the contact was getting highlighted…

I really don’t know what else to try ?? All help or advice would be really appreciated!

All the best and happy new year!
Gioia