Might be a similar problem like I had:
Serious file owning issues (CWP Users own installation files)They planned to fix that, but you might be still affected by that problem.
Basically use
repquota -a -s
to see the quota.
And use
find / --user <username> | less
To see which files the user owns.
If it's a normal CWP user that owns installation files that root should own instead, you need to fix those directories / files with
chown (and maybe chmod too).
Both commands have a option for recursion (-R), but read the manual in case you don't know them already.
Basically I changed the ownership to root:root (so user and group is root) for the files that were not in /home/<username>
and then fixed permissions with chmod as I thought it would be approiate (o-rwx).