permalink not working when translated

Hello everybody

I started translating my projects on my porfolio and since I did the permalinks are not working anymore.
When I click on my project I get a “Oops! That page can’t be found.”.

I don’t understand what can be the problem as the permalink are the right ones.

Here is a link to my homepage where you can click on a project to see:
https://emiliekrasi.com/fr/home/

I already asked support from my theme and they said it’s coming from polylang.
I’ll be glad if somebody can help me, I can’t find a solution anywhere.

Thanks a lot!

https://www.ads-software.com/plugins/polylang/