Justin,
Roll the handle again on a flat surface with the joint overhanging the edge, not touching the surface. If it rolls flat, the joint tenon has warped and most likely can be fixed if you desire.
My experience is that if a shaft is straight, minor warps in the handle do not affect play. Schons tend to stay straight, but I have had a couple that warped in the handle area myself.
Roll the handle again on a flat surface with the joint overhanging the edge, not touching the surface. If it rolls flat, the joint tenon has warped and most likely can be fixed if you desire.
My experience is that if a shaft is straight, minor warps in the handle do not affect play. Schons tend to stay straight, but I have had a couple that warped in the handle area myself.