Bot trading in Bittrex

[tomvildc]

When I come to see Verge(XVR) coin on bittrex. https://bittrex.com/Market/Index?MarketName=BTC-XVG.
It seems like very strange, from chart with Open, Close, Low, High price are the same in a group of days. And follow the transaction, I saw it always buy at 68 satoshi and sell at 67 satoshi. So, what is this? Why they need to do that?