Community auth forced login

Here are some more details I gathered after testing.

I have 2 users :

• "admin" who has the auth_level 20 which corresponds to the role "admins"
  
• "user" who has the auth_level 10 which corresponds to the role "users"
  

When I'm logged as admin, I get the issue I described. Works once, but then I'm logged off when I refresh.

When I'm logged as user, if I call the force login method manually (because not shown in GUI for users) and I log as admin, it works fine. I'm not logged of after refresh, and I stay logged as admin.

Before I render my views I have this line :

PHP Code:

$this->isAdmin = $this->verify_role('admin'); 


If I comment this line, everything works fine.
So this method "verify_role", disconnects the user if he is not admin, apparently.

Is this the normal behaviour ?
If yes, how do I verify if the current user is in a role, without disconnecting him in case he's not.

That "isAdmin" variable is accessed from the Views so I can determine if some fields, buttons, etc.. need to be rendered.

Thanks in advance.