I have an issue with my website <http://www.kuhm.fr/> and the "+1" on all pages (like <http://www.kuhm.fr/erreurs-communes/>): when people click on "+1", the number increases, but if you refresh the page, the number is the same than before.

The worst : then the button is red (so Google see that the visitor plused) but his "+1" is not recorded.

It worked once (some monthes ago) but now it's over.

Shares (and +1 on shares) are ok, but not "+1" on the website.

Some idea to help me ?