Pipeline User problem

Wrong user of running pipeline

I have currently Pipeline with 4 jobs on it. Pipeline is triggering only manual.
I faced with an issue, that user of each pipeline after 1st one is always user who made a commit.

  1. COMMIT1 arrived. Commit create by USER1
  2. USER2 is going into Gitlab and trigger pipeline.
  3. First Job: "triggered 21 minutes ago by USER2
  4. But Second and Third Jobs: "triggered 23 minutes ago by USER1

Why user changed when 2nd Job started?
Any idea how I can control this.

Thanks a lot!