PeopleSoft Purchasing over receiving

We are on image 31, PTools 8.56.  We are seeing intermittent instances where users are able to fully receive a purchase order quantity with 2 receipts.  So for example the purchase order has a quantity of 1 but users have created 2 receipts each with a quantity of 1.  In this example, we purchased 1 but received 2. We have not been able to replicate this and are wondering if anyone has experienced this issue.  Our biggest issue with this is it's happening with inventory items and both receipts are pushing the quantity into inventory (directed putaway) which is overstating the counts.