There was a recent question on MathOverflow which was just incorrectly migrated to Science Fiction & Fantasy (where it has been promptly deleted). I suspect the reason the question was migrated is because it contained colourful language (King Arthur, Witches, etc.).
It is debatable whether the question belonged on MathOverflow anyway (Fedor Petrov commented that it was probably more appropriate on Art of Problem Solving). However, I am worried that future questions with colourful language might be incorrectly migrated to another Stack Exchange site.
Is this a new feature (or bug) where questions are automatically migrated? Or was this a moderator decision?