Problem solved.
You need to choose what server groups your server uses and put admins you want to that group.
1. Go to your Sourcebans 2.0.0 alpha adminpanel and choose "Groups".
2. Choose "Add group".
3. Fill the needed info. Choose "Server Group"
4. Now you have done the server group. Go back to adminpanel, and choose "Servers".'
5. Edit the server's info where you want to add the group.
6. Choose the groups you want to.
7. Now go to edit admin and put it to that server group you want to.
8. Go back to "Servers" and click "Server Admins" from that server you've added server group(s).
9. It should look like this:
(But ofc with your info.)
10. Now go to the server and reload map and ban yourself for 1 minute and go to look your SB and see if it worked.
Edit: Damn that wasn't bug.