Title and image not showing when Publicize posts to FB

We have Publicize set up to publish our posts from https://www.marxisthumanistinitiative.org to Facebook. However, only the content excerpt will show and no images are showing. We have tried to add the title by using the Custom Message but we would rather have be formatted like a title should be.
The images used in the post are not showing at all.
I have used the FB debugger and everything looks fine there:
https://developers.facebook.com/tools/debug/sharing/?q=https%3A%2F%2Fwww.marxisthumanistinitiative.org%2Fphilosophy-organization%2Fnew-podcast-series-radio-free-humanity-the-marxist-humanist-podcast.html

Please let me know what I can do and how to do it.

The page I need help with: [log in to see the link]