1) In PowerStore, confirm.php, line 512... Should be as it is:
$WA_indexField = "DetailOrderID";
The index field it is asking for is actually the index field of the Cart, or the OrderTable index field, which is DetailOrderID.
You should change this back otherwise you may have issues with items being mysteriously deleted and extra items when someone goes to paypal and then returns to your site to shop again using paypal standard.
2) is technically not a bug, and the names were close enough so that you were able to logically deduce the correct association without aide of documentation. It is a valid point, but probably not worth updating at this point unless we were already updating the database structure of that table.