TWO monster zoos on one floor?

[decimator1337]

It seems to have glitched the thing out. I cleared the zoo, but it also revealed a circle-shaped room I haven't explored yet. It's also cyan on the map, and even though I cleared the zoo "114" monsters are still left (in the other zoo?). Huh.
EDIT: So I went to the second room, and it was full of monsters. The music did not restart, nor did it say "MONSTER ZOO!" again.
EDIT 2: Only after clearing both zoos do I receive an item.

[bananasloth]

I think this is pretty normal, at least it happens to me too, though not nearly as often as single-room zoos :)

[Haldurson]

There's split zoos (where the zoo covers two adjacent rooms) -- that's normal. The double zoo, where the rooms are completely separate, is a known bug. But it's possible that they decided to just let it be, so it's now a 'feature'.