Quotas not working

Hi,

when I go to Server Settings -> Disk Quota I see that they are enabled:

Your disk status from the file /etc/fstab

proc /proc proc defaults 0 0
# /dev/md/0
UUID=ce15e640-9bf1-4f63-b092-f277073e632a none swap sw 0 0
# /dev/md/1
UUID=bec17f8f-9b93-40a9-802c-56973800ed93 /boot ext3 defaults 0 0
# /dev/md/2
UUID=d16f9a2f-1f7a-443d-aef8-71ff54b3f999 / ext4 defaults 0 0
# /dev/md/3
/dev/md3 /home ext4 rw,seclabel,relatime,quota,usrquota,grpquota 0 0

but when I go to User Accounts -> User Quota  I only see the root user and no one else:

*** Report for user quotas on device /dev/md3
Block grace time: 7days; Inode grace time: 7days
                        Space limits                File limits
User            used    soft    hard  grace    used  soft  hard  grace
----------------------------------------------------------------------
root      --     20K      0K      0K              2     0     0       


but I have 5 users and with different packages with disk quotas.
Why is this happening?
Any help on how to fix it ?