Need Help w/Facebook-WordPress problem

For some reason when I put a link in Facebook to my WordPress site, (ie: https://seeleyjames.com/bioe/ ) the graphic comes up as Mr. Anonymous instead of the featured picture, or any other pic.

I’ve tried using Chrome, IE11, Firefox, and Safari – all have the same problem. Only when I use Opera do I get options for other pics (default is Mr. Anon). This also happens with Hootsuite and Bufferapp.

What did I do?

Thanks, Seeley