you're not using cwp compatible quota you need to follow this tutorial https://forum.centos-webpanel.com/centos-configuration/how-to-setup-user-quotas/
after adding to fstab :
/dev/sda1 / ext4 srjquota=quota.user,jqfmt=vfsv0 0 0
usrjquota=quota.user,jqfmt=vfsv0
reboot the system and then run again
mount -o remount /
quotacheck -avugm
quotaon -avug