Why does the approver sometimes receive the approve order notification and sometimes does not for the orders that are eligible to be approved?

The system triggers the Approve order Email almost 10 minutes after the order is placed. If the order gets approved before the system triggers approver order request, then the system will not generate the approve order request because the order is approved already and when system looks for the orders that requires approval, it does not find the order that requires approval as the order is approved.
 
If the Approval plan is created with correct rules and the approval plan is set correctly at the site and site user level, then approver should receive the emails for all the eligible orders. If the order is eligible for approval and the approval email is not triggered, then most probably the order is already approved before the system generates the approve order notification. 
 
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