Candidates with 'New - Rejected' status

Summary

When a Requisition is filled other profiles status turned into 'Rejected'

Content

When a Requisition is filled i.e, after hiring a candidate, system automatically updates the status to 'Rejected' for all candidates including the candidates who are in 'New - To Be Reviewed' status even without moving the candidates to further steps. Basically what we think about these candidates were rejected (Negative Impression) and there is a chance to avoid these profiles. So Is there any way to change the status for these candidates without 'New - Rejected' status.