ethereum – Bittrex Market History Confusion


So I recently made a very small test order of Digix DAO in the Ethereum market (Using bittrex), and I noticed that it showed up in the Market History section.

It looked a little like this (NOT EXACT)

BUY - RATE 0.0... - TOTAL 0.0... ......

So I bought X DGD with Y Ethereum.

However, there was no SELL order to compliment my BUY order.

When I bought the Digix DAO, I bought it from a seller, who sold it to me. Why isn’t his SELL order in the market history, but my BUY order is?

This also applies for the opposite: What does it mean when there is a SELL order with no BUY order to compliment it?