I have been noticing some errors that seem to be going on with the PM system, particularly with my outgoing messages. There are people who faithfully respond to my messages, yet there were a few old messages to them that showed up to me as "unread", and had been there for a while, and it seems the recipients never saw them. That by itself didn't bother me, as those messages were kind of out of date anyway.
But today someone responded to one of my messages, when I had sent multiple ones, and she said that although she saw all of them at first, after replying to one, the rest of them were gone from her inbox. It seems all of them got moved to "read" on my end, yet on her end they just disappeared. I was wondering what might be going on.