Wrong launch planning

[lusy777]

I tested a launch with scheduling every 2 hours, that is like
* */2 * * *
and I see in scheduler_task table the same in schedule field, but also I see a wrong time for next launch
ex.
last_run: 2021-02-17 12:43:07
next_run: 2021-02-17 12:44:00

that is, the interval 1 min, after that it's change to 1 hour.
what could have happened to this? maybe wrong configuration?
also in the configuration I installed timezone and no idea how to get correct schedule.

[badams]

This is likely because the task failed and threw an exception, if the task fails by default it will be retried on the next cycle

[lusy777]

Thanks for your response!
How can I remove this default re-creation?
Just we try to run a few tasks every 2 hours and the scheduler check new task every 5 minutes. But after the first launched the next_run field changed +1 minute or +5 minutes. I've confused, why it so happens? tasks just to add jobs to queue, there without any errors.
Thanks!