What just happened?! BTC jumped from 5.x to 7.x and return. Now is trading at 5.x but by cents, there're no ask walls, you would need to go up to over 8 to see the first 1k+ ask.
Someone bought a huge amount of btc, big enough for prices to go up to 7$. Then, it fell down because the orders weren't moved up to this same level.
Right now someone put a buy wall at 7$, so it may stay there for a little while.
edit: and by the time I posted this, the order got removed. hm.