facebook share button not take product image

hi, i have a problem with facebook button when share the product , a standart facebook share button dont take a product image as is right, but take a some image in description or give a blank white page in facebook. i try to use some modules to fix it but no success. . using OC 2.0.1.1 with journal theme , but the them is not a factor. facebook button is standart from OC , not some extension.

here is a link to site , if you want to see what is happend http://www.bglev.org/bulgarian-t-shirt