Laravel 5.1: Scheduled Job Output mixed with all job

Using Laravel 5 schedule job I noticed that when there is more than one job working at the same time, the output of the jobs, is mixed!

Something weird, because if they run for several minutes and each has simple output like:

Job X, step 1: complete
Job X, step 2: complete
Job X, step 3: complete

The output that I get in an "Scheduled Job Output" email will be:

Job 1, step 1: complete
Job 2, step 1: complete
Job 2, step 2: complete
Job 1, step 2: complete
Job 1, step 3: complete

In additional sometimes I get more than an email for a job, like 2 or more emails incompleted. Only the last one is full of the output. like:

1° email:

Job 1, step 1: complete

2° email:

Job 1, step 1: complete
Job 1, step 2: complete

3° email:

Job 1, step 1: complete
Job 1, step 2: complete
Job 1, step 3: complete

I know for sure that are the same jobs, because at the top of the output I print timestamp and name of the job. Why?

via Chebli Mohamed