As of Pets, creating some NPCs also toggles the downtownie switch. If you continue to make NPCs after the switch has been flipped, they will be based on the downtownie templates, not random Sim templates.
That'd explain why my paper delivery kids were turning out weird, I noticed it eventually corrected itself once I moved on to make some other NPCs. The skintone thing is still being wonky for me though, sometimes it listens but most of the time it does what it wants. I've double and triple checked all the settings on the tree and the only one it isn't following is the skintone selection. I don't create in batches anymore, the last time I did I ended up with a neighborhood full of men in shorts and sandals. *shudder*