I have answered via email too with an amended file. Thanks for reporting this issue, we've been able to identify a bug that occurs when using a Y Spline in conjunction with the X-Rotate property. However there is a workaround that maintains instancing you can use instead. Remove the existing Y Spline and use the Generator's Y Size
property instead. You can then rotate the array into the correct position using the X Rotate
property set to 90 degrees and you should find it renders correctly.
I hope that helps, please let me know if you have further questions.