It is a know "problem" that the system awards the points a month prior to finishing the work year. The same thing happened to me, I only complete 3 years of experience mid-february but I have already received my additional points. From what I searched in this forum, it is ok to accept this ITA with these additional points, as long as your work experience letter is signed some days (around 5) after you actually complete the year of experience. I am likely to receive an ITA next draw and will accept it, but only gonna submit all documents at the end of february, to guarantee that my 3 years of experience is actually completed by the time of the AOR.