Hey there! You are correct that the chart is wrong; enemies are on a 4-6, actually! There's a post below a bit where someone noticed the same thing, and I gave some corrections. The Lone Adventurer YouTube channel also noticed that there is a slight error on the door table where we have the "1" result for both dead ends and "1-2" for one door.
My layout guy is going to correct all of these for the next version. It might not look like it, but this thing went through a lot of revisions, despite looking like Baby's First RPG Development Project.