[Plugin: Socialize] Facebook "like" button is always Clicked

Hello!
Not long ago I started to notice an weird behaviour in the Facebook Like button at my site: the “like” button acts as if once you “liked” one post, it counts to all the other posts.

Right now, all the posts are showing “85 likes”, but once you like one post, you cannot like another…

Ex.: http://maismoda.com.br/lancamentos/lupo-glam-legging-com-detalhes-de-tachas/
http://maismoda.com.br/moda-news/extra-renova-parceria-com-o-estilista-marcelo-sommer/

I tried to desactivate/activate the plugin and to restart the permalinks, with no success…

Thanks for any help! I love this plugin, would like to keep it. 😉