Why is the Silent Hill 2 OST not in 1st place in the Video Game Music top list?

Out of all the video game OSTs Ive looked up Silent Hill 2 pretty much dominates most other albums in terms of ratings, especially the albums in the top 10 charts for video game music. The only album that comes close to it is the Undertale OST. So why the hell are those albums not in 1st and 2nd place? Theyre not even in the top 50. I always thought the charts for genres are determined by the ratings (how many stars and rating count ratio) all the albums get, which seems to be the case for all genres except video game music.