Wrong behavior of "Add curve" in "Animation" window when object has few same colliders

2) How can we reproduce it using the example you attached

1 Create new project
2 Create sphere and add second and third SphereCollider to it (see attached image)
3 Open Animation window and choose sphere in the Hierarchy
4 In Animation window - press Add curve, notice 2 SphereColliders present
5 Try to unfold one SphereCollider -

Result: both SphereColliders are unfolded and second SphereCollider has all items duplicated (see attached image)