Vote note saved for nodes

Hi,

Votes on comment work but for nodes, it has strange behaviour.

For exemple : http://partagelibre.fr/forum/annonces-du-site/mise-%C3%A0-jour-4-juin-2015
You can up or down vite comments, it works (you can try, anonymous can vote) and it's saved.
But if you try to vote for the first post, the icons become grey for the first clic and if you clic a second time, votes results are changed. But if you reload the page, your vote for the first post has not been saved.

update : same problem with latest dev version