As you may know, one duty of a witness is it to provide a price feed for steem. Based on the broadcasted pricefeeds, a median price from the last 3.5 days is calculated and influencing the author rewards and the vote value.
At the moment the steem/USD price from the bithumb is way off in comparison to other exchanges. At other exchanges, the price is currently by 1.69 USD, but on bithumb it is 2.34 USD. This causes the price jumps on coincapmarket:
You can see the Steem/USD price for different exchanges:
Due to the high 24h volume, the price from bithumb influences strongly the average price.
Poloniex and HitBTC show a price which is lower than the price listing on other exchanges. Due to the low 24h volume, they do no influence the average price.
coinmarketcap.com removed the listing of bithumb shortly:
The top 20 witnesses are doing a great job and broadcasting the correct steem price. Some witnesses are broadcasting a too low steem price as they including the exchange price from hitbtc (maybe without using the 24h volume for doing a weighting average).
P.S.: Don't get fooled by the price bias as I'am.
Output from: https://steemd.com/witnesses:
Result from http://steeme.com/witness:
If you like what I'm doing, please consider 