Facebook Share Image From Unknown Source

Hello, I’m trying to find where this site is pulling it’s Facebook Share Image from. I’ve set it in Yoast in the backend, cleared out what I thought was the default location/post it was previously pulling from, and looked on this site’s actual Facebook page as a page admin for any settings that would configure this specific image to be used.

Nothing is removing the old image this site wants to remove and replace with a new image, even if I try to define the new image as the default to use in the Yoast settings, or anywhere else.

What am I missing? Thanks!

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