A small team of planetary scientists from the California Institute of Technology, Université Côte d'Azur and Southwest Research Institute reports possible new evidence of Planet 9. They have published their paper on the arXiv preprint server, and it has been accepted for publication in The Astrophysical Journal Letters.
It might be a miscalculation of orbital body models, which has happened before. Urbain Le Verrier was able to predict Neptune’s existence. Then he tried to predict a planet between Mercury and the Sun, because the current Newtonian physics wasn’t lining up to observations, a similar situation to how Neptune was found. Then Einstein’s work on gravity modeled the orbital bodies more accurately, ending the debate if there was another planet closer to the sun than Mercury. Just a different food-for-thought point of view, as I don’t know what the answer is obviously.