Group permissions on django admin have no effect

In the django administation, there is a place in user edit screen where I can set permissions :

When I set djangoldp_circle | circle | Can delete circle, I expect that this user would be able to delete all circles, not only the ones it has created.

In the same fashion, I would expect that checking the Superuser checkbox would give the user all the rights.

Those rights should reflect on the ACL returned by the REST endpoints.