cron jobs still executing after it is remove in directadmin panel

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http://serverfault.com – I have problem on cron jobs that are still executing even after removing them. I already view all the possible cron jobs from this article. All cron config files are empty or my cron task are not present. I also came up with this command for user in $(cut -f1 -d: /etc/passwd); do echo $user; crontab -u $user -l; done. And it returns no crontab set for all users. Are there other ways to check currrently executing cron jobs? (HowTos)