You might try entering your url into this link: https://developers.facebook.com/tools/debug
It will give you feedback on what it is pulling into FB. If there is a problem with your picture, for example: too big, too small, etc., it should let you know. It should also clear the FB cache for your post.
When I have had this problem in the past, it is because I forgot to save the photo before I uploaded it again. I would try flipping the original photo, saving it, then upload it again.
If that still doesn’t work, you might be able to turn it in the FB post. Click on the link below:
https://www.facebook.com/help/community/question/?id=100254010165291
Hope this helps!
You can create a page and save as a draft. It will show up in your listing of pages but will not appear on your site until you publish them. Hope this helps!
