So all this began when I tried to renew the four items on patron P60047 's record. Problem: I hadn't hit renew, I had accidentally hit check in (both options look very similar, I need to remember to hit the "Renew All" button at the bottom of the screen and ignore the options on the right side of the screen). So, I thought, "Okay, well, I'll just look at the Circulation Log, and my transactions will be in there. Then I can see the items I returned and re-check them out to the patron." But when I looked through the Circulation Log, none of the items were on there. What was really bizarre was nothing I had checked in this morning, now sitting on our shelving cart and in our media drawer, was in the Circulation Log. And I individually clicked on each item in the Circulation Log and recognized none of it. Also: when I looked at each item in the Circulation Log for "Last Borrower" none of them had p60047 on it, nor did any of the items have any record of ever being checked out. I'm completely confused and will have to rely on the honesty of the patron to tell us which four items she has checked out so that we can re-check them out to her through Koha. The problem is that the number being stored in the circulation logs is not the item number (as the code believes it to be), but rather the biblionumber. It's been this way for a very long time, and surprisingly no one has noticed.
*** This bug has been marked as a duplicate of bug 7241 ***