Originally Posted by
CappuccinoAddict
Thank you for all the responses, everyone. The aircraft is still showing as a 787-9 but of course there's always the possibility it switched to a 330 or 340 and then back to a 789 and that messed up the seats. Someone here also mentioned there could be a fault with that seat. If that were the issue, it would be nice to be contacted about that and to be notified of the reason for the move. I suppose that's possible too, I hadn't thought of that. My plan is to show up early to the airport and see what they can do.
In the grand scheme of things, I am still in Upper Class so I can't complain too much.
You could look at the seat map on EF as sometimes seats are indicated there as blocked when they're just marked as occupied on the airline's own seat maps. For instance, this tends to happen with DL which is a VS bilateral JV partner.