[MothEnthusiast]

This one's proven very hard to reproduce, but it's gotten me a few times by now. When an LFG pops up (which may even be delayed since I've only rarely gotten to the person putting it up), it can stay there for a long while after being taken down, leading to a lot of confusion if you're trying to find the person in question. Putting up your own LFG can immediately reset the list though, from what I've noticed. Switching between tabs does not seem to reset it in the same way, unfortunately.