I've noticed that Poloniex has large spreads on a few markets. I've been observing the order book of these markets, and I've noticed something weird - even though there are a lot of trades executed, these trades are happening at prices far away from either side of the order book. I've noticed this pattern in several markets on Poloniex.

In the example I've linked below, there are a lot of takers who are selling AAVE/USDT. The trades are executed at price well above the highest bid price in the order book. So who is buying AAVE/USDT at those prices?

Maybe I'm missing something trivial, I'm fairly new to exchanges. Is anyone able to explain to me the behavior I'm seeing here, please? Thank you.

https://ibb.co/m5fhdkPg