Campaign Playlist Leaderboards Score Problems

I’m confused by my recent experience attempting to set high scores for Halo: MCC CE:A campaign playlists. For example, I played through the normal difficulty, 10-level campaign playlist and scored, cumulatively, over 110k points, which would be number one. However, on the leaderboards, I’m ranked much lower with a score in the 60k range. How’s that possible??

I’ve also tried to play through some of the smaller CE playlists, which I had played beforehand (not attempting to set a high score), and my new scores weren’t even reported at all, instead just showing my old score instead.

I know having your score show up on the leaderboards is vanity, but I really think it’s kind of troubling that literally 45-50k worth of points are just…gone.