If you throw the ball correctly, it is supposed to hit only four pins, the 1, 3, 5, and 9 pins on its way through the pindeck. Leaving the solid nine pin means that you are not.
If you turn the ball pretty hard, you will eventually leave a solid nine pin. However, if you are leaving more than just a few, your ball is not acting correctly while going through the pins.
If your ball never fully reaches the roll phase (still in the hook phase when it enters the pocket and hooking past the nine), or goes too long and finishes with too sharp an entry angle (Going so sharply sideways that it goes rolling in front of the nine pin and into the eight pin), you can leave the solid nine pin.
ALSO, if your shot is "high" on the head pin, the ball can do what I refer to as "jerk" set, leaving either the solid nine pin or the four-nine split. This is a couple of things happening at the same time. Usually a high shot AND a strong finishing shot at the same time.
Now, is there an adjustment for it? Yes, but you need to be able to diagnose which reason it is, because the resolution is different for each reason.
Best advice I can give without seeing it is this: Watch the ball and see where it is going off the pindeck, and what direction it is going when it does exit.
Sideways motion off the deck often means you have hooked it past the nine pin (I.E. ball never fully getting into the roll phase with poor or little deflection), while backwards motion over the eight pin often means that you have rolled it past the nine (I.E. sharp transition with too much entry angle with too late deflection).
