I am having this issue now. The first day worked fine, and testing worked fine (we launched Monday August 26). Then Tuesday and today the Publicize feature associated the wrong thumbnail with each story. Happened again today.
I read through these posts and none of the issues/solutions seem to apply to our site. Each post has a featured image. When I manually share a link from wordpress to facebook, I get the option to scroll through 3 thumbnails, and they seem chosen at random; none are the featured image associated with the post, so even manual sharing is not working right at this point…
Any help will be appreciated.
https://www.facebook.com/auburnmassdaily
https://www.auburnmassdaily.com