I did not mean removing the translation. I mean, that the server redirects back automatically to the english version, whenever you visit the page with any query arguments, like so.
Try visting https://americanos.ca/pt/?xy=
it will automatically redirect to the english version: https://americanos.ca/?xy=
The server removes the “/pt/” URL part. That is either done via htaccess mod_rewrite, or via custom rewrite rules somewhere in a custom code.