PO Approvals Notification not triggering to approver multiple times

HI Team,

We have created all purchasing rules under Terms Approval Serial

We have defined 3 rules

Rule -1

Approver A

Rule-2

Approver-B

Rule-3

Approver-C

Approver-A

Once PO submitted Approvals are going only once to Approver A.

Any suggestions.

Regards,

Irfan.M.