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I am not sure which version of EBS you are using, but you can look at the following notes:
Troubleshooting for Requisitions / Purchase Orders in Process or Pre-Approved Status (Doc ID 225017.1)
Requisition Approval Workflow Fails With LAUNCH_PARALLEL_APPROVAL ERROR In AME and CLM Functionality (Doc ID 1320955.1)
I would suggest you to do AME run real time transaction.
Approvals Management Business Analyst -> Then choose Purchase Requisition Approval -> Test -> Run Real transaction Test -> Choose transaction id
See if the approvals are coming in the correct order here.
Also check if approver has any vacation rules?