When Nadesplosion was added, two new bugs were introduced. First, it has no description - when you type /power 6 you just get the list of powers. Second, when you get 18 intel captures, any more won’t give you new powers. It’ll give you the same one (including level) repeatedly regardless of /powerpref. That’ll leave you with 3 unfilled power slots.
EDIT: These are fixed. New one a little farther down.