Task Reassignment Workflow - Task is reassigned without approval of Manager

Hi,

I am using the OOTB Task Reassignment workflow of Ms Project Server. However, the workflow is behaving very strangely, the task is reassigned to the new task assignee even before approval of Task Reassignment by the Manager.

Is this a Permission issue or some policies have to be changed? I am looking for quick help to solve this issue.

Any help in this regard will be appreciated.