I searched all over the Internet, but I did not find a normal explanation. And when I saw that the leaderboard speedrunner shows a score that gives a ghost at the end of the game, I decided to ask here.

I think its random

The points thing is random. I believe it was added by the old mods to spice things up in the leaderboards and to check whether it was related to the final time you get. I've been feeling like removing it specially because not many people even fill that in, so I may do that eventually if it's not a big deal.

i researched it today, it just picks one of 4 possible scores at random using UnityEngine.Random.Range()