verified guest but still required acceptance to booking

[Bo A Vanecko]

i have instant booking on my airbnb account and the only stipulation is agree to house rules and government id (and verified of course).  the first booking came through instant...the second one though i had to accept for some reason.  it was a 6 night so met 3 night min.  is there something i am missing on my settings? 

thanks in advance

Bo