1.7 Urls & declination bug language

[mamascotte]

Hello,
 
I am in the process of finalizing my shop in 1.7 and I meet a major issue.
 
I managed to put my declensions with attributes for my products (and in one language because impossible in both FR and EN, one crushes each other each time) but the URLs are still problematic.
 
Indeed, when I am on a product page and I change my language (on top of website), it returns an ERROR of type 404 => the page does not exist.
 
I think the error is related to the declensions and construction of the url.
 
Example: https://fiesta-mascotte.com/N/en/Rabbits-Mascots/14183-394654-buy-rabbit-mascot-costume.html#/1-taille_size-s/2-couleur_color-non_no/3-ajout_de_logo_add_logo-non_no/4-ventilateur_fan-non_no
 
 

Have you ever encountered this error?

 

Any help is welcome.

 

 

Thank you