We put it in the second-chance pool, described at https://news.ycombinator.com/item?id=10705926 and the other links there. It's an experiment in giving good stories that fell through the cracks another chance at getting attention on the front page.
I think it has to do with the user's karma, a post from a user with heavy karma ranks higher, if you noticed there is another post ranked 8th from a user with 20000+ karma and only 5 votes.
Karma doesn't affect story ranking.
My apologies, I thought post ranking has to do with karma.
As mentioned, just curious how the upvoting works here. Would be great if someone could help explain.