That is a good chart epiktrades but I have a quest

That is a good chart epiktrades but I have a question for everyone about level2. Why is there a bid and an ask but then someone will sell below the bid? I have been trying to find but there is nothing I can find that explains that. Can anyone help? For anyone that never heard of level2 This is what level2 is Level II is essentially the order book for Nasdaq stocks. When orders are placed, they are placed through many different market makers and other market participants. Level II will show you a ranked list of the best bid and ask prices from each of these participants, giving you detailed insight into the price action.