MMC in PC does not grant punctuation

Hello, I have the Master Chief collection on PC through Steam, I have the whole pack and I play Halo 3.
After having achieved all the achievements of the game, I only need those of time and score, but above all those of score, when I put the skulls that I want to multiply the points, it does not do it, before starting the game it tells me x0. 00 and when I’m playing it by doing attack combos and so on (which should give me several points) it doesn’t, it puts “0” in red and so the score in the HUD stays at zero all the time. I have the game updated, I did not try uninstalling it and reinstalling it, but, I would like to know if there is any patch or solution since I want to make the score achievements in the campaign. In competitive if the points in the playlists are normal, but in campaign as it should be not.
Thanks and regards.