I recently got into a multiplayer game with a friend of mine, and as he tried to queue, I swapped from Orks to Space Marines. Or at least, I THOUGHT I did (dun dun duuuuun). While my doctrines and Elites did change over to Space Marines, aswell as my colour scheme, it did not actually change my chosen FACTION.
Both in queue and in game, I was still playing as the Orks, despite even in-game being able to see my Space Marine doctrines, Blood Ravens paint scheme, and not actually having access to ANY Elites (Naturally, we lost that game). While I do have pictures of this strange phenomenon, it won't let me attach them to the post. Will keep trying, but still.