This is down to FLY having taken over the flight and tactical seating is now in play. There's a thread elsewhere on that.
Currently on your flight 12BEFJ are showing as blocked in FLY with all others occupied in the WT+ cabin.
Code:
A B D E F G J K
12 W - X - X X - X - W
13 W - - - - - - - - W
14 W - - - - - - - - W
A B D E F G J K
Seats
Premium Only P
Available +
Handicap-Accessible H
Paid & Premium #
Occupied -
Blocked X
Lavatory L
Paid $
Location
Exit Row E
Wing W
Upper Deck U