Project : closed status does not lead to close project

Hello,

i'm facing this issue : i change status of project to "décommissionné" wich is a "closed" status :
 

The project is moved to status "décommissionné" but is not closed, only closed date is set but not status :
 

Note : if i set closed manually, ProjeQtOr said :
 

But nothing when changing status.

If y say "Yes" to the queqstion, status is correctly set for project and associated milestones.

Regards,