The old saying about the inmates running the asylum may be true in some instances where your characters have led you into places that make no sense and have nothing to do with the plot you sat down to write, but … they can also take you places you had not dared to go before and your writing ascends to a new level. Let the battle between plotters and pantsers continue. There is room for both in the wild and wacky world of writing.
The existential dilemma of whether or not to follow your characters wherever they might lead.