Debug is showing no errors or warnings, my og:image is 200x200, and even then I get other 2 miniatures in the share page in facebook.
I tried to explode the og:image to 1000x1000 and then it was the 1st option presented instead of the actual 3rd, so I think the image size of those 2 other images are the matter.
I saw that the og:image should be the only miniature offered, once it's validated.
I would like it to be so, please advice. Thanks.
Seems like I'm not the only one, it's a bug in facebook
https://developers.facebook.com/bugs/239522122851150?browse=search_51337c9877acf8202975193