Actually, the problem is not fixed. It is pretty urgent as advertisement is running.

The homepage and other landing pages where there are a mobile and a desktop version are not working properly
1. it is the mobile version which is displayed on both the mobile and the desktop
OR
2. it is the desktop version which is displayed on both the mobile and the desktop

Please test the homepage (chaleur-naturelle.fr) on both the mobile and the desktop and you will see the problem. Please note that you should try on the logged out version.

Thank you for your quick answer

Arthur