No shadows on 4k remaster

So I bought a One X, and was testing the new 4k remaster of Halo 5 to the vanilla version on my One S. The game is absolutely gorgeous on One X, however, I am noticing that the other characters are not casting any shadows on the X, but are on the S. The character I play as is casting a shadow on both consoles Is this a bug or did they remove shadows in the 4k patch?