CRON job...

Why this injecting everywhere front end, back end, even when I was doing email template for different component via back end, and when it send it to myself and I read the source code I found this, which it shouldnt be - i understand if automation cron ticked and it should be use backend only or only com_payplans area?

I understand the real cron task should be used on actual cpanel cron task or at least generate cron code or something to provide user to create themself for cron task cpanel?

<img alt=Cron Job Starts src=https://www.-----------------------.co.uk/index.php?option=com_payplans&;view=cron&tmpl=component style=display: none;>

Thank you.