Hi yophie, and maybe your array curve did not do what you thought - when you do an Array curve to replicate an object along a path, the object is duplicated along points calculated along the path curve. If you use the "Align to surface" option, it will also look at the surface normal at each point and make sure that there is an additional rotation done to keep something that was starting out coming off perpendicular from the surface to stay perpendicular to the surface at each copied location. But that option is for making copies of something that sticks up vertically along the surface normal like a little spike or cylinder or something like that. If you're copying a curve instead like you're doing it does not guarantee that the copied curves are on the surface at every spot along the curve. In general ArrayCurve can't guarantee that for curves it is copying because it only does a move and rotation of the base object, it does not try to morph or warp the curve to make it stick down to the surface at all points along the curve.

- Michael