Running cron job manually will duplicate the job

Hello

Recently i found that when i run the cron job manually, it will create a duplicate job and the Next run date is set to 1970-01-01 01:00:01 (54 years 4 months ago)

Also it’s not executing the cron job with manual run initially.

It takes some times to run and then the duplicate created job is gone.

Can you please help to sort out this issue?

Thanks
Tejas