DOR submitted through ESS gets approved by workflow systems

We have a Document type which will be submitted by HRs or line managers or by employees through ESS.

The approval is that when a line manager or employee submits it should go for approval to HR Reps and if HR submits it should be auto approved.

We have separate rules for line manager and employee conditions, with same approval route.

When a line manager submits it directly goes to HR rep. But when Employee submits, the transaction gets approved by 'Workflow systems' and then goes to HR Reps.

What is the difference here? Is there a way to skip the workflow systems approval?