Could be lots of things as stated above. When I'm shooting RIGHT (I'm a lefty) I need to remember to "paint my face" when I relax my draw hand to release the string. This means the draw hand recoils along my face towards my drawing shoulder.
I'm assuming you are a RH shooter which means "left" would be the group direction if followthrough needs to be in better alignment with the string and shoulder.
Notice I make no reference to what I did "wrong", only what I should do correctly next shot.
Sometimes it is simply a tuning problem that doesn't show up at closer distances. But in my experience, such tuning inaccuracies will show up ate 10-13 yards and definitely long before I get out to longer distances.