Issue in purchase order approval

Hi Team,

In one of the issues raised by customer , the purchase order is stuck for approval by an approver whereas it shouldn't.

The approval route APPROVAL is set like

From Amount     Person      Responsible     Priority

1                         123              abc                 A

1                         456               def                 B

2                         456              def                   A

2                         789              ghi                  B

100,000              111              JKL                  A

100,000               222            MNO               B

An OP/B (Non stock PO) is entered with an amount of 12,600. The status summary is as follows:-

Approval Route Code     Person Responsible             Status          Release Date              Release Time

APPROVAL                             def                                Bypassed       17/04/18                       222843

APPROVAL                              abc                              Approved          17/04/18                    222845

APPROVAL                             def                                Bypassed          20/04/18                    2554

APPROVAL                             abc                               Bypassed          20/04/18                     2555

APPROVAL                             ghi                                Bypassed           20/04/18                   2556

APPROVAL                             def                                Approved             20/04/18                   2559

APPROVAL                             ghi                                 Pending

APPROVAL                             def                                 Pending

User concern is