I will resolve this question YES after closing.
@Milli yeah, using it as a test bed for the new liquidity withdrawal feature, which seems to be able to cause some odd effects. I think most of the weirdness is due to me injecting liquidity when the market was at 99.8%, which seems to have permanently made it super screwy even though I withdrew that liquidity.
Playing around with the new liquidity injection/withdrawal feature. Appears to be doing some odd things to the probability and my bet history. Somehow I ended up being able to sell all my YES shares without moving the probability, which seems odd. Never fear though, I'm not trying anything sneaky - I will still be resolving this YES.