Since E-coin sell your bitcoins on exchange, there is a difference between the buy price (most companies show it on the main page) and the sell price (in your e-coin cabinet), called "
spread".
Obviously We will see the difference in buying and selling price Even You can see these kind of difference in money exchanger also Because due to the profit, traders selling and buying with some margin to get profit. This is basic all the trading sites. Not only E.coin