Found on:
Unity version: 2021.3.19
Operating system: All
Curve Architect version: All
When using Undo (Ctrl + Z) after un-parenting deformations and followers to re-parent them to the Architect Curve, all objects will reset their curve space and curve rotation values to 0. This issue seems to occur only in Unity 2021 and I have not been able to reproduce it in versions 2019, 2020, 2022, or 2023. It appears to be related to a bug within Unity's undo system.
The bug occurs on all operating systems.