Steps to reproduce (Users Page):
1. Click on edit button for user.
2. Add and/or remove a couple of roles.
3. Submit form.
Repeat a few times and a role is added to the selected list that does not exist.
A non existent role is added to the user and can be removed from the list but eventually shows up again.
Should be able to add and remove roles for a user and the correct roles are shown.
Workaround (if any):
The role does not exist in the system so should not create a problem.
Failed : Safari / Firefox / Chrome