Why can't HR Representative approve twice in serial in Promotion approval rule?

Summary: Why can't HR Representative approve twice in serial in Promotion approval rule?

I have the below requirement -

First Approver: HR Representative

Second Approver: Line Manager

Third Approver: HR Representative

Currently the First Approver is skipped and the workflow goes straight to the Second Approver and then to the Third Approver. But it is important that the HR Representative approves twice.

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