I notice that if you click multiple times on the same assign role button (which is apparently disabled after the first time you click) you can get the same role displayed multiple times on the erolled users table. You will get a no ending repeated roles if you assign and remove several times, clickin on the same role also several times...
Can anyone reproduce this same problem?
Here's an image:
Another problem we noticed is that you don't need to click exactly on the plus button to assign a role... the whole table cell is working as a button.