Hello, @David,
Thank you for purchasing our theme and for reaching out to our support center.
To address the Facebook Incorrect Thumbnail Issue in WordPress, please refer to the instructions provided in this article: https://www.wpbeginner.com/wp-tutorials/how-to-fix-facebook-incorrect-thumbnail-issue-in-wordpress/.
We hope this will resolve your issue.
We appreciate your business and thank you for choosing 8Theme.
Best Regards,
8Theme’s Team