PO still in incomplet status after an approbation by user in other hierarchy

Dear Community,

I would like to know if someone has already encountered the same behaviour as explained below.

The user_1 creates an order with amount is 25500 and executes the approbation process. The user_1 selects the hierarchy H1 and the user_2 as next approver.

In this hierarchy H1, we have 6 users who have differents limit of amount to approve the order:

user_2 limit 1000

user_3 limit 10000

user_4 limit 30000

user_5 limit 100000

user_6 unlimit

When the user_2 receives the notification he approves and then it is the user_3 that receives the notification.

The user_3 delegates the approbation to another user that belong to another hierarchy H2, this user has the same limit as user_3