As the ejector wears in, it'll shift your empties elsewhere.
My brother's 1991A1, when new, ejected left, right, forward, back, straight up.....changed with about every shot.
After around 300 rounds it settled down to forward-right and has stayed there ever since.
"And Shepherds we shall be. For thee, my Lord for thee. Power hath descended forth from thy hand, that our feet may swiftly carry out thy command. So we shall flow a river forth to thee and teeming with souls shall it ever be. In nomine Patris, et fili, et Spiritus Sancti. Amen."