OK, this is a bit off topic, but let's talk about it a bit, because even I as a moderator am not fully understanding about this topic.
The title under your name depends upon several things. Bob is a supporter, and that earns him the right to have whatever he darn well pleases, including identifying as a dyslexic Frank Zappa groupie. If you join a group, the name of the group is identified, so a person who joins the DIR Practitioner group will have that identification. If you join more than one group, the one that will show is the one that is the highest ranking in a somewhat arbitrary list of rankings. If you do none of the above, you will be identified as some sort of seal life, in another arbitrary ascending order based on the number of posts.
I've got all that; here is what I don't understand. Notice that I am listed as Scuba Media and Publications, the highest ranking of the groups. I never joined that group, and I have no reason to join it. If I were to leave the group, then I supposedly will be named by my next highest ranking group. I would indeed leave the group, if I had the option to do so. Since it does not appear in the group list, I can't un-join it, but then, since it does not appear in the group list, I couldn't have joined it in the first place, could I?