What is the controlling factor for the PO IDs that appear when linking to PCard transaction

We are seeing varying results depending on the search parameters and differing cards when the user is in reconciliation and clicks the link purchasing details for the PCard transaction. In one instance we get only those PO's that are using that specific card and in other instances we get every single open PO whether it has a ProCard linked or not. Why? What is causing this situation? Why are we not getting only those PO's that are linked to that specific card? Or at a minimum, getting only those PO's that are assigned a ProCard?

Trying to see if we can find how this works and how to properly limit that system for our users to reconcile more efficiently. As it sits now, they must look up every PO or keep a tracking sheet outside of PeopleSoft to track which PO's are using which cards.