I booked a flight in CE this afternoon. I've selected my seat in MMB and confirmed the seat. I've received the email confirmation regarding changes to the booking. My seat shows on the My Flights App.

The cabin was almost full when I selected my seat, with only one other seat available.

I've just done a dummy booking, as I was checking what to expect up front on a Titan 757 (somebody posted that they are dry in another thread). I could see that there were still 2 seats available. I proceeded with the booking through to 'Reserve Seat'. On opening the page, the seat I'd previously selected was still vacant. It seems it is still up for grabs!

How can this be?