Thanks for the file thanulee, and for the clip.
Please have a look here:
Clip (one minute)
https://www.amazon.com/clouddrive/share/Jv4RuQJ4E2fu6kCoZMEiFCCUGxeKRfMSwWPnRXu0Iuu
I hope that clears the problem. The Spline had before only a few points, and those are then used to create a new Hair.
If the is anything else you need, let me know.
All the best