VolGroup-lv_home problem

dev/mapper/VolGroup-lv_home
21G 119M 19G

After
/dev/mapper/VolGroup-lv_home
21G 209M 19G

After
/dev/mapper/VolGroup-lv_home
21G 210M 19G

After
/dev/mapper/VolGroup-lv_home
21G 240M 19G

After
/dev/mapper/VolGroup-lv_home
21G 500M 19G

the above file system always rises up as i dont even put any etra files or add any on i dont know the problem that causes it it shows private file by it self or the log files that is not on the system would this cause the problems if yous can help out i will be happy thanks

[root@59 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
50G 2.8G 44G 6% /
tmpfs 2.0G 0 2.0G 0% /dev/shm
/dev/sda1 477M 45M 407M 10% /boot
/dev/mapper/VolGroup-lv_home
21G 20G 10M 100% /home


[root@59 ~]# sudo du --max-depth=1 -c -h -x /home*
388K /home/shoutcast
101M /home/sohbetb
54M /home/ozelchat
16K /home/lost+found
7.8M /home/sohbetc
4.0K /home/var
163M /home
163M total


[root@59 ~]# cd /home
[root@59 home]# du -s * | sort -nr | cut -f2- | xargs du -hs
101M sohbetb
54M ozelchat
7.8M sohbetc
388K shoutcast
16K lost+found
8.0K aquota.user
8.0K aquota.group
4.0K var

on the accounts private and faulty logs in the files it wrights some things which i dont understand always keeps on rising on th hdd what can it be done or how can i do it