I have a domestic trip booked this summer. Just noticed the seats for my partner and me on one of the segments were changed from 2EF to 1EF. Fortunately 2EF were still available so I changed it back, but while doing that I noticed the seat map showed only 2 rows in F and 31 in Y for this aircraft, which doesn't match any seating charts I could find on either Seatguru or the United website. It is showing as a 737-700 in the reservation.

So what kind of plane is this? Will it have IFE? Why isn't it showing on the website? Seems odd.