AOR Parallel Approval not working as expected

Summary: We have configured approval for Approve Performance Document wherein the first approval should go parallelly to an AOR type Delivery Partner and once Delivery Partner approves, the second approval should parallelly go to AOR type PRM. Both the approval should work on the basis of whoever claims it first.

But, upon configuring the rule as Parallel in Edit Approval Participants, the approval goes parallelly to both Delivery Partner AOR and PRM AOR at a time, which is wrong.

Content (required):We have configured approval for Approve Performance Document wherein the first approval should go parallelly to an AOR type Delivery Partner and once Delivery Partner approves, the second approval should parallelly go to AOR type PRM. Both the approval should work on the basis of whoever claims it first.