I was accidently logged into my wife's account while trying

I was accidently logged into my wife's account while trying to book a flight to MSP. Saw a bunch of seats were available. When I switched over to my account all those seats were gone. I am A list preferred. What is this?! Take a look at the screen shots. Same exact flight, just A list vs non. You would think A list should be able to get the better seats.