This forum is NOT the right place for this question. Saying that, however, here's an answer...

383 is the TOTAL points that a lvl 21 HQ gives you, not the points you get from building that one level. The points difference between the total for lvl 21 (383) and lvl 20 (319) is the points that you gain from building that one level. I.e. 383 - 319 = 64 points.