Steps to Repoduce

1 - Create one user "user1" in administrators group
2 - Login as user1 and create one folder
3 - logout and login again as admin
4 - Go to "Administrator users" group. here we can see that we have two users: "administrator user" and user1
5 - Delete "User1"
6 - view again the "Administrator users" group. Here we can see that the "Show more results" button is enabled. Click on it
7 - Now we have two "Administrator user" instead of one

Note1: If we clear ezplatform caches, then the list is again correct
Note2: If we clear only browser caches, then the problem persists
Note3: If we do the same with a user that didn't create any content, then the problem do not occur