I had this same question. The RAW seemed very unclear to me. "The marbles above this one are therefore moved up." Sounds like this is a typo and it should read "The marble(s) above this one are therefore moved down."
No typo, the rules as written are correct for the marbles. The front of the line is the bottom of the ramp, so when you move your marble down towards the front of the line, you have to move the other marbles up to make room.
This topic is about the treasure market scale, which is the opposite, the preferred positions are on the top. And as Chris says, the obvious thing to do when moving one treasure up is to push the others down to make room.