Permalink redirect to home page or 404

Hello,

I have some issues on 3 pages with Polylang. All our others pages works well.
We have multiple languages enabled, french being the main one.

https://www.domain.fr/fr/telecharger/ (id 1941) -> click on pt flag -> https://www.domain.fr/pt/descarregue/ (id 3278) redirect (http code 307) to https://www.domain.fr/pt/en/ (SORRY, NO POSTS FOUND)

https://www.domain.fr/fr/contact/ (id 67) -> click on vi flag -> https://www.domain.fr/vi/lien-he/ (id 2406) redirect to https://www.domain.fr/vi/

https://www.domain.fr/fr/recrutement/ (id 645) -> click on vi flag-> https://www.domain.fr/vi/tuyen-dung/ (id 2420) redirect to https://www.domain.fr/vi/

Same problems if i use id to access the page : https://www.domain.fr/?p=2420

But if i use preview, it works : https://www.domain.fr/vi/tuyen-dung?preview_id=2420, except for https://www.domain.fr/pt/descarregue?preview_id=3278 when it stills redirect to https://www.domain.fr/pt/en/ (SORRY, NO POSTS FOUND)

I tried deleting the page and recreating them, and it is the same, even if i recreate them empty.

Any idea ?

Thanks.