As a side note, and out of curiosity, is there a mechanism on HN I've missed? Soon after I submitted this link, it was around #3 on the front page, but when I r

As a side note, and out of curiosity, is there a mechanism on HN I've missed? Soon after I submitted this link, it was around #3 on the front page, but when I refreshed 2 minutes later, it'd dropped to #25 and didn't rise again even though it was still quickly gaining points. As an example, right now, this post has gained 199 points in 5 hours and is at #49, but the submission directly above it at #48 was also submitted 5 hours ago but has only gained 6 points. What am I missing?