[Branda] Role user problem withe network admin

I have as network admin a mysterious behaviour with the user role for the toolbar visibility.
I have only "Network Admin" and "Guest".
This is as it since 3.1.1 i think. And i was waiting 3.1.2 for that thinking there was a bug. But with 3.1.2 it's the same behaviour.

My co-worker as network admin can see all the user roles (author, contributor....).
I have try with others browsers (delete cache, cookies....), i have try to empty varnish cache, i have tried to create a new user admin and it's always the same : only 2 users roles. #wtf
I really don't understand what's happened. It's seems to be a problem with my network admin account on the multisite. But how to do ?
An idea ?