The numbers aren't wrong, they're just in scale tones, which is mentioned in each book only once. This means that the 1 represents the tonic note, and the numbers after it are the successive notes in the scale. The 1 can be whatever you want it to be, then you just make the numbers the same for that scale. so if 1=C then 2=D 3=E 4=F etc. etc. If you chose to make 1=F as STL usually does, then 2=G 3=A 4=Bb, 5=C, etc. etc. The numbered notation allows you to be able to play in any key so long as you can tell your mind that all the 1's now are this note, etc. etc.
They list C as an example, but they usually write in F. I agree that they should change the example, or at least mention the fact that the numbers represent scale tones more than once.