These are access logs, they don’t necessarily mean that a WordPress cron event runs every time it gets accessed.
You should look into what is triggering these requests. It might be a rogue plugin, or it might be an external script or a server-side cron event.
If you don’t have cron events that are scheduled with a recurrence of 20 seconds then it looks like something is incorrectly triggering the cron spawner in WordPress. Unfortunately WP Crontrol can’t help with that, that’s not what it’s designed for.