Also often see this - patients are often leaning forward while sitting. Needle should be perpendicular to the plane of the chest, not parallel to the floor, which would carry you into the bundle in a lean-forward situation.

Often I see this - intending to strafe just over the rib, but starting too low (out of fear of being too high), so the needle ends up directing toward the bundle to get over the rib.

I try to start mid-interspace with slight downplane angle. Safe and if obese, will promote contact with the inferior rib, then landmark is achieved and can retract and adjust accordingly.