I had a similar problem, but somehow, after pasting repeatedly, it’s working (for now).
Inside FB (when I uploaded the largest graphic advised)…
WARNING: Your default Facebook thumbnail image dimensions are smaller than the minimum 600 x 315 recommended by Facebook.
Sharing Debugger…
Share App ID Missing
The ‘fb:app_id’ property should be explicitly provided, Specify the app ID so that stories shared to Facebook will be properly attributed to the app. Alternatively, app_id can be set in url when open the share dialog.
My site: http://womenlearnthai.com
It eventually worked but in the Hemingway CSS. Looks great!
Fixed … well, in the process of being fixed. I’m having to add code to 700+ pages.
Ditto loving this theme!
I tried your suggestion and it didn’t work (stays the same). Do you have anymore suggestions I could try?