I needed to switch to coincap.io a few months ago (coinmarketcap is no longer free) and there seems to be a bug in their current price discovery logic (https://coincap.io/assets/steem shows the same price). Looks like they currently only use Bithumb as source (prices should come from various exchanges and an average value should be delivered via the API). I guess/hope that it will be fixed in the coming days.