I looked at your URL for that article on the Facebook Sharing Debugger. Just looking at it initially, the last scrape was 2 hours ago and the 404 title was on the preview (as you're seeing in your screenshot). However, I then re-scraped the page and the preview was updated to a correct title and description.
This shows that the Open Graph tags are correctly set on the page now by JFBConnect. I believe the problem is probably either of the following two - At the time you shared the article either a) Facebook couldn't connect to your site b) the article was not yet published / public so Facebook couldn't retrieve the correct tags.
I'm unsure what you mean by the last post. Did the new article with the same content work, or did it have the same issue? Whenever new content is created though, please do not try to share it until it's published and public or else Facebook will not be able to see the contents and will get a 404 error, just like an ordinary guest.