Hangfire recurring job doesn't start immediately

recurring
Tags: #<Tag:0x00007f499f65ac30>

#1

I am using cron expression for creating a recurring job. I am creating expression to execute every half hour : /30 * * * * , The execution is correct but at the first time it starts is not correct.the job first start executing after 10 minutes.but I have a other job, every 5 minutes(/5 * * * *) execute, when i commit the job, the job first time start immediately. so how i can keep them same behaviour?
Env: Mysql + .net Core 2.1 + Hangfire 1.7.4


#2

supplement startup:



#3

Are there other jobs running in a higher priority when this happens, or is this the only job?