Mandatory information about my setup:

Have I searched the tickets before posting? Yes
Have I searched the forum before posting? No
Have I read the documentation before posting (which pages?)? No
Joomla! version: 3.3.6
PHP version: 5.4
MySQL version: 5
Matukio version: 5.1.1
Direct link to the page that shows the issue: http://bang-marsas.fr/jouer/parties


Description of my issue:
I set up "Show Participants for" to Registered Users in the Basic tab of General settings, but even when I'm not logged in, I can see the button participants (X) and by clicking it, I can view the participant list.
I think it's a bug.
Thanks in advance
Steve