Link image size

Hi! I have a problem with fb auto post:
in my profile it shows the big image layout but in the newsfeed it shows a little picture on the left and in line, on the right, the description.
I have og tags set up in my site and I checked all the requirements explained in your article (facebook-new-bigger-shared-link-thumbnail-images).
The only thing is that the thumb images of my posts are a little bigger than the recommended size… I don’t know what to look for to resolve this issue, and I really like this plugin!
Please help!

Here’s the link to my website

http://wordpress.org/plugins/social-networks-auto-poster-facebook-twitter-g/