This has happened a few times now recently (before and after today's patch), but I can't quite find how to reproduce it. Basically, when you're the leader of a TMM group, you can double-click people's names in the little "Online Friends" box to invite them to the group. Sometimes though, it bugs out, and when you double click a name, it invites yourself to your own group.

In this photo, I'm LeeChaolan, and I'm double-clicking on Iruul, but it is just inviting myself repeatedly.