"I moved years ago — why does Norway still consider me tax resident?"

Because moving is an event and emigrating is a legal process: under the 3-year rule you generally stay fully taxable until you've had no home in Norway and limited stays for three full income years — documented. The discovery usually comes years later, backwards, with interest. If you moved without filing the emigration position explicitly, get your facts reviewed now; the repair is cheaper the earlier it starts.