I can fix this now by deleting sessions and reentering them, but I am leaving them alone for the week so you can research a few bugs.
The 4 original sessions were created using a method suggested in this thread.
http://paizo.com/threads/rzs2v3t6?Unable-to-report-session
Step 1: Use a "Report" link from another event where it was available. I was using a blank event.
Step 2: Switch the event key in the link with the event key in the link for target event's "Edit" link.
Step 3: Fill out session report.
Another bug I have found, any integer I type in the "Find Another Session" box, if no session exists, the system creates a new blank session with that number. I tried a letter, which didn't work. I tried "2" and "-1", which worked. I tried "5.6" which resulted in "6".
The event # is, again, 602736.