Checked the file and all appears OK,

one question - are you choosing the number of sets, before or after centre snapping to the large circle, if one types in the number of sets before centre snapping to the large circle, chances are the angle will change from what is required, which is why I always centre snap first and then alter the number of sets, just the way I work, others may do it differently. however if the sets is correct and one types in the same number (or just uses tab then enter), the angle field won't change so sometimes one needs to type a different sets then backspace key, then the correct sets for the angle field to automatically reset (or type I the angle manually).

The above is just a guess as to the problem, as your file worked ok form.