Some reported Pathfinder Society games went missing after the Core Campaign update and this problem still seems to persist. In fact, after the Core update went live, I lost two sessions, but after that one more seems to have disappeared from my list of GM'd scenarios.
I know that two of my runs of the scenario The Blakros Matrimony are among the missing ones. Other GMs have reported problems with this scenario as well. There is a workaround to the problem that was discussed in this thread, however, I purposefully didn't use it so that I would know when the reporting system was trustworthy again.
Hopefully someone is still interested in looking into this and not just leaving the system buggy. I created myself both of the events in which I ran The Blakros Matrimony, and as I mentioned, I haven't touched them since the Core Campaign update. If someone working on the PFS reporting system can use my help tracking down the root cause of the problem, I'd be happy to help: feel free to poke me and I'll PM the session details to you.