Lost CSS when authentifification
Finaly I found the problem.
The real problem was not because the user had this or this role.

But the view that i wanted to show had specifc class for some objects for user with Administrator Role.

Example :
an 'article' can have 'contextual' class when the user connected had Administrator Role.
the same 'article' does't have it  when the user connected didn't have Administrator Role.

I am new in drupal 8, so...