Whenever there is a new site, Stack Exchange creates a room for it, and posts:
Welcome to chat for: [site]
This is a general discussion room, but please feel free to create more subject-specific rooms (a single room with every possible discussion isn't very helpful)
For playing with chat features:
and remember; please read the [FAQ] ;p)
Which is a pretty good service. Another thing it does is that it re-creates the room if deleted.
Another job of Stack Exchange's is to freeze or delete old rooms.
Now, put these two together and you get:
(See here, 10k chat and chat mod only)
Looks like the SE bot is deleting these rooms as they get old, then noticing that the room is missing, and re-creating it.
This seems icky to me. I propose that the system either stop deleting the main chatroom, or it should stop recreating it.