Can't delete cron job

I'm logged in as user, not root and there's no way to delete a cron job. I click on DELETE button and confirm but cron line is still listed after page refreshes.

I thought it might have something to do with permissions. cron file that control panel creates is owned by root:root so I changed it to user:user but that didn't change anything. Still can't delete.

EDIT:
It seems that cron jobs added by users are not running at all. Ones that were set by root (thru whm) run fine. I even tried restarting crond.

Same here. When logged in panel as user no way to delete any cronjob from the list.

zoom out?

Any errors in Apache logs?