Thanks!
Two answers to the labyrinth question:
First, you shouldn't be able to get the labyrinth result except on multi dice rooms (Towers and Halls). It is intended that if you have a room that's next to a Hall or Tower, you don't include the entire room in the sum, just the physical die that the room is touching. Small example but if you have [6][6][3] you'd have a Hall with a total of 15 (Arboretum) and a Split with a total of 9 (Kitchen). I wanted Labyrinth to only be likely to show up if you had a particularly large Hall or Tower, where it would makes sense that the interior could be broken up into a complicated maze. I just didn't have enough space to explain things fully enough to avoid confusion.
Second, the nice part of this system is that even if you don't resolve things the way I intended, you still end up with something you can use. In your case, if I ended up with several single room labyrinths, I'd be tempted to say that they're all connected with portals or some weird non-euclidean geometry. Or a less esoteric answer could be that those are all entrances to a labyrinth that stretches across the floor below the rest of the dungeon.
The third bonus answer is that the exact results the dice spit out is often not super coherent or useful as is, and requires a bit of finessing on the part of the user to make it work at the table.
Anyway, hope that's helpful!