Does anyone have an explanation of when you get a lot of karma why there isn't a 1:1 relationship between the votes a post gets and how much the account?

Somewhere around 100k karma (I know, "on the leaderboard" problems...) the amount of points I got for posts (but not comments) reduced considerably compared to the number of upvotes a post gets.

I thought it was a fixed ratio (1/3rd?) for posts and 1/1 for comments? Can't tell you for sure about posts as I mostly just comment, but someone else can surely jump in