Order Mentor bug, changed personal story arc
Having done the Whispers arc with my wife, I know what I’m supposed to be doing.
Have you played in a party within someone else’s instance? If so it’s not a bug but an intended “feature” and badly implemented design choice. If you accept progress while doing someone else’s story you are put on the same path as them until the next arc. There have been several “bug reports” about that but the official response is it’s working as intended. Also, given it has been this way since launch, it seems it’s going to be that way for a long more time.