It's changing fast, so maybe there's a lag.

I still think it might be due to the restrictions at Predictit. I think you can spam Predictit with lots of max buys, because there's a fairly low cap. That would make it difficult for the authentic bettors on the other side to balance it out, because there aren't as many of them and they individually aren't allowed to wager more.

That's at least how it worked at one point. I haven't checked it out in a while.