Thank you for your question. Nor33 is not a typo. It is correct. There are two types of tone 3 words, those written with a “3” and those written with a “33”. The word for two is written with a “33”. For more details of Taiji Romanisation for Penang Hokkien, I explain it here: http://www.penang-traveltips.com/taiji-romanisation.htm
I hope that helps and feel free to ask any further questions!