Apparently this wasn't a very strong round.
Well, actually the average indicative score is nearly identical to the previous round. But the scores are a bit more squished together, and yes more people are seeing a drop that a rise.
EDIT: There was a similar trend in my last roulette, with scores generally rising in the first few rounds, but that didn't happen in earlier roulettes (which were album roulettes). My hypothesis is that as a group you're not necessarily sending better artists, but take a couple of rounds to get better at figuring out which songs I'll like.