Incorrect systemd timer



I set up a service timer to run the service every minute at times
01:10:50, 01:10:50, 01:10:50, ...

Description=Run watchdog job at every 1 minute
OnCalendar=*-*-* *:00:50

But the timer was actually fired about every 8 - 9 seconds:

Mon Sep 27 01:10:06 UTC 2021 start timer
Mon Sep 27 01:10:15 UTC 2021 start timer
Mon Sep 27 01:10:23 UTC 2021 start timer

Not quite sure if it is a kernel issue or Yocto oe-core build issue or
what I could be missing, appreciate your advice.

Thank you.

Kind regards,

- jupiter

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