[Plugin: Facebook] Recommendations have gone crazy

First, thumbnail, or featured image by facebook recomandations seems to be random from the entire site, not from post. Mostly, it sometimes picks from one specific post and apply to the others.
Second, the recommend tab sometimes gives me a number of recommendations, say 10 people recommended this (which, by the way, is showing in portuguese like this “10 pessoas recommended isto”, instead of “10 pessoas recomendaram isso”). But when I see the post, it says: 1 pessoa recommended isto…

http://wordpress.org/extend/plugins/facebook/