Hi,
You have third party plugins. You can deactivate them one by one and check the issues again. Example related post plugin cause the second issue.
Also you can use this custom css code to remove them;
Thanks for your quik answer ! And i have understaood that when i am logged them on Chrome apperas the alert-message “Le module carrousel a été désactivé car une extension ou votre thème remplace le shortcode [gallery].” When i am not logged it desappears…