from some kite site that sells them:
NOTE: The Standard is framed with a 3 wrap and includes an extra 2 wrap frame. The Full Vent is framed in 4 wrap and includes an extra 3 wrap frame. The Mid Vent is framed in a 3 wrap, no extra frame is included. I can customize ALL of these models with the frame combination of your choice and no extra charge (Excluding the RACE FRAME, which is $45.00 more).
The SOME KITE SITE you are referring to has just updated that listing, since beginning mid last year, Mid Vents DID receive the extra frame, and I believe all B Series models include TWO frames now. So...I don't know WHO the one framed B series was purchased from, but if was from said SOME KITE SITE, please call that person and request the extra frame!