Again on Bittrex sell side is 18% bigger than on Polo,but buying side is 2x lower. Strange anomaly.
I don't know there have also been very strange anomalies for example for Synereo (AMP). At one time it was trading 40 or so % higher than on Polo, and it took hours and hours to be even again. At the same time at least one exchange disabled the wallet of course...