Why audit report shows incorrect data if user makes changes to Approval tasks

Summary:

Audit Report shows incorrect user data if any user makes changes to Procurement Approval tasks from Setup & Maintenance

Content (please ensure you mask any confidential information):

If any user makes changes to below setup approval tasks from Setup & Maintenance, the seeded audit report shows that the change has been made by "Applications Development Framework Application Identity for Procurement" instead of showing actual user details

1. Requisition Approval (Manage Requisition Approval)
2. PO Approval (Manage Purchasing Document Approval)
3. Supplier Registration Approval (Manage Supplier Registration Approvals)
4. Supplier Spend Authorization Approval (Manage Supplier Spend Authorization Approval)
5. Negotiation Approval (Manage Supplier Negotiation Approvals)

Please let me know how to know which user has made changes to above approval setups or is it an Oracle bug?