I couldn't even begin to explain how it works because I have no clue. Is it possible? Who knows! I just find it hard to believe that it's one big coincidence every time it happens. Like I said before, without a doubt, it's always the same couple guild tags when it happens. That's one hell of a coincidence.
For what it's worth I also had someone from one of the guilds I am talking about admit that some of their guild mates are using hacks. Just because others don't see it or can't explain it, doesn't mean it's not happening.
Is it something to get all crazy about? NO! It's life. Whether it's sports, video games, your job. People will always look for the advantage to get ahead. Even if that means cheating.