I have Magento 2 setup of version 2.2.2.
I have set the cronjobs as per guidelines.
When I check the
cron_schedule table I can see multiple duplicate cronjobs entries.
created_at is the same for the same
scheduled_at time is set with a difference of 1 minute as per the below image.
I haven't changed any default configurations in
configuration -> Advance -> System -> Cron (Scheduled Tasks).