Ok, thanks,

try to be short and clear. I had contact with the developper of the plugin, he had a look, and said that it is the Enfold theme who make this problem happen.
The problem is : Page title “Choix du restaurant” all the same on all pages. This title is not a page or post name, this is the first name of a fieldset generate by the plugin on the page http://letirefesses.fr/test/. All titles on pages are replaced by this “Choix du restaurant”. If i turn off Enfold, then titles are right, like “Accès, Test” etc. When i turn on, all titles turn to “Choix du restaurant”!!!
Sorry to disturb you with, but seems that Enfold have a problem with this plugin.

Thanks, best regards