Okay, I know what it's doing. It's passing the username of the person who started the topic as the username variable. You're only getting notifications for the topics you should be getting notifications for. They're just being addressed to the topic starter.
I'll see what I can do. But I can't make it a really high priority right now. It had to have become an issue with the new profile modification. So, I'm going to have to go in and check where it's passing the username variable and see if I can't run it down and fix it.