LNER have reversed the seat maps for their trains. Their own site reverses the reversed map, to make it the right way round.This happens all the time to me on LNER and Cross Country, no matter what I select - Table, Forward, Window - I get the opposite - Airline, Backward, Aisle.
On LNER I use the seat selector to change my seats and there are *always* ones that meet my preferences.
My understanding is that LNER have chosen to do this and refuse to fix it; presumably because it benefits them by encouraging people to book directly with them (thus reducing the risk that people find cheaper split tickets elsewhere).
Our site will let you choose a specific seat, but you'd need to refer to the seating plan PDF document, to ensure the seat matches your particular requirement.
LNER are trying all sorts of tricks; check out this thread to find out some other examples of what they are up to!