Often times, the list includes prices which aren't available in reality.  Gotta keep going up the list.  The true price at any time is often higher than what the order book indicates.  It is an inefficient market.  Max does a great job, but it is not perfect.  The only orders which are guaranteed are those in green highlight.  You can accept those orders without contacting the seller.  The MSC is already on deposit in escrow.  To claim those, just send the bitcoin.