I run fixquotas but a specific account is wrong, actually used is:
[email protected] [/home/ijkhqdzz]# du -sh /home/ijkhqdzz
1.1G /home/ijkhqdzz
...while in cpanel/WHM show 2.1 GByte space used
[email protected] [/home/ijkhqdzz]# du -sh /home/ijkhqdzz
1.1G /home/ijkhqdzz
...while in cpanel/WHM show 2.1 GByte space used