I've had this happen when MQ2 is not involved at all, not /zone, no /gate, no /fade. I'll get tells for buffs because I show up on /who in a zone that I was in, but am no longer. I've also sent tells to people which /who showed in my zone and they weren't. I guess I did have MQ2 running while I did this, but wasn't actively using it. Obviously, I can't say for the other people.