Hi @Minami
Alignment.SuperelevationCurveAtStationis processing the alignment list first item (unique value/element) with stationing list first item. Ser lacing to Longest, so the node operates 線形1 alignment - whole station list items (Dynamo Lacing)
I would recommend to check C3D Superelevation help so you can consider transition regions as cross slope needs to transition along the alignment.