I have verified the source code of my site. The source code indicate the proper og:title and og:image which simply perplexes me as to why this is happening.
The debugger is clearly not flushing it's cache for some reason I can't explain. It is reporting a redirect error - this could be the reason why but I have no idea how to fix it (I have no other plugins enabled).
Here is what the debugger reports. Note I've hidden my domain but rest assured, it is correct.
Critical Errors That Must Be Fixed
Error Scraping Page: Bad Response Code (redirect)
Errors That Must Be Fixed
Circular Redirect: Circular redirect path detected (see Redirect Path section for details).
Final URL is in bold (this is the URL we tried to extract metadata from).
URLs that are part of the circular redirect path are highlighted.
This is what is in my source code:
<meta property='og:image' content='http://www.http://domain.com/wp-content/themes/tranquil-reflections/images/sleepingboudha.jpg' />
<meta property='og:description' content='Un site d'informations sur le monde merveilleux du Yoga, de la cohérence cardiaque, de la méditation...' />
<meta property='og:type' content='blog' />
<meta property='og:title' content='My Personal Site' />
<meta property='og:url' content='http://domain.com' />
<meta property='og:site_name' content='My Personal Site' />
<meta property='fb:app_id' content='151428364975354' />
<meta property='og:locale' content='fr_FR' />