BTCChina went down for maintenance, but a lot of orders kept showing as if someone was always buying BTC that noone was selling, always at market BID and ASK margins...

I already noted that a lot of trades happened without the orders even get into the board, always around the same BTC amount... Is that a way to forge high trading volumes?? Has anyone noticed that already??

http://s27.postimg.org/it9id0uxf/BTCChina.jpg