I noticed this last night too https://steemit.com/steemit/@dksart/something-strange-is-going-on-in-the-markets-sbd-double-the-price-of-steem
it almost seems like someone purposely inflated the value of SBD so they could buy cheap STEEM on the SBD/STEEM market exchange on steemit.com, when this happend STEEM was selling for around 0.50 on steemit.com market, it has been slowly increasing since but the 24 hour volume on the steemit.com market is over $50k, normally it is between $12k to $20k