I did look at another post here that apparently had the same issue. I downloaded the app and have tried a couple of different things to solve the issue, since I got the error message: ...previously had type 'article' and cannot be changed to an object of type 'website' to avoid data corruption of existing actions.
(Don't laugh, I'm newbie to WP!)
First, I wondered if it was because I was "re-using" an image and I needed to upload one previously unused or unattached.
Then I tried using the shortcode for the image URL.
I did look to see what the FB scraper was actually seeing, and since I've deduced that I need to look for og:image... I saw that it was still pulling the first one.
So, not sure what the issue actually is (besides ignorance). Any help would be much appreciated!