Hi @gartaud
Thank you so much for getting in touch.
Could you please head over to WordPress Dashboard > Settings > Permalinks and confirm if your URL Structure is set as below?
/index.php/%category%/%postname%/
If so, and you want the /index.php/ to appear in your URLs, please make sure the site structure reflects the same.
To do that, please head over to WordPress Dashboard > Settings > General and set the WordPress Address (URL) and Site Address (URL) according to your needs.
This should fix the issue for you. Let me know how it goes!
Looking forward to helping you.