Support Knowlege Base
Why is My Facebook Share Image Wrong?Category: Social Media Sub Category: Facebook
if a URL has previously been shared on Facebook (by anyone, anywhere), Facebook "remembers" the information associated with that URL (like the image, title and description) even if it's wrong or a completely blank image.
If you don’t have Open Graph tags specified, Facebook can only do it’s best to fill in the blanks for image, title and description. Since Facebook is not a mind-reader, the result is rarely what you want and sometimes really bad.
The following article explains how to fix it https://www.sangfroidwebdesign.com/web-design/facebook-share-image-is-wrong/.