Issue publishing on Facebook and Twitter

Hello, I am using Jetpack Publicize however this does not work, and even why I try to manually share the page then the thumbnail does not appear, only the link. Maybe there is an issue with duplicate Open Graph meta tags, but I don't know where to look at ... I am not an expert at all with wordpress, so thanks for explaining me with easy words :-) my website is : www.ventsetvoyages.fr