Hierarchical approval within the same status

[Sandra Priedīte]

I need to configure a workflow, so that there are 3 approvals within the same status. The thing is that, first one person must approve, then only the next, and only then the third. Every next person shouldn't see this ticket for approval before previous person has approved.

I have created a back-loop from Approved back to Pending approval - in this loop I add next person (condition determines if second or third person must be added) - I have a field, where these approvers are listed.

The problem is, that when ticket is back to Pending approval, first person (who has approved) is again listed in in the Approvals needed section even though, this person is also in Past approvals.

Am I missing something in default configuration? And all of this configuration is not needed? Or is there some specific behavior of approvals, if field is updated at a later stage (another person added to the list)?