Left side Unity, right side Houdini, same asset in both.

Can anyone shed light on why a copy to points operation could see the correct outcome in Houdini (straight pieces and curved in the right position), but in Unity pieces are generating in the wrong / different position?

If the curve is flat in Unity (all points at p.y 0) then they generate in the correct position, but if there is elevation to the curve (some points above p.y 0) then pieces are generating in the wrong different position?

Thanks in advance.