404 page Tag problem

I have a strange problem: when I create tags, the WordPress taxonomy is of the type https://www.miosito.it/tag/NOME – and this page is both accessible and indexed.

For example: https://www.futuroprossimo.it/tag/concept/

What I notice is that tags are automatically created for the different language versions, and those are not visible.

The “wrong” taxonomy, for example, for the French version is:

https://www.futuroprossimo.it/fr/tag/pangea

And it’s wrong.

It should instead be https://fr.futuroprossimo.it/tag/pangea which is visible.

Why, if I have set the site names as en.futuroprossimo.it, fr.futuroprossimo.it and so on, does it create two types of tag pages?

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