Scoring Multipliers Bugged? (probably)

Hey all,

I gave up on this game the first week for it’s bugs and it’s been sitting collecting dust since.
I decided to try it again 5 months later and if it wasn’t playable I was going to trade it in.

The MP is still screwy but I don’t have long wait times as long as I pick Halo 3.
I still can’t get into a H2 anniversary or CE.

However, the campaign’s been fun but when I try to beat the par score my multipliers don’t work correctly.

I tried pillar of autumn on Legendary with 5 then 7 skulls and I would still be at like 800 points half way through the mission, While videos of people show them near 13000 at the same point with less skulls on. I’m not using Bandana. If there’s already a thread for this I’m sorry.

Thanks