Anomaly regarding Facebook image posts

Website:
http://aiplifestyle.com/

The 6 most recent blog posts don’t show the correct image when posting to FB. All others seem fine. I checked most of them in https://developers.facebook.com/tools/debug Some of the incorrect posts have this error: Provided og:image is not big enough. Please use an image that’s at least 200×200 px. Image ‘http://aiplifestyle.com/wp-content/uploads/2013/08/Jessica-Headshot3-244×300.png’ will be used instead. I think it’s referring to the profile image that is on all the sidebars: http://aiplifestyle.com/test-mthfr-genes-can-inhibit-methylation-pathways/

All posts show the correct image in the debugger. I appreciate any assistance. I’m not a coder, yet can muddle my way through some things.