Avia layout builder elements/random images showing up when post URL to Facebook

When I try to post my site URL to Facebook to include a thumbnail image, I get a carousel of images below it. Some are from the Avia Layout Builder backend that don’t even show my sites content and there is an image that is not even in my media library that also appears. How can I fix this and just show a single image when I post the URL to Facebook? The site is: http://www.be-wellcoaching.com. If you go to Facebook and type the URL in a post you can see the images that appear. I would like the image from the top layerslider to appear. I have installed Yoast SEO but that didn’t change anything. Thank you.