a way to split one animation into multiple hkx files.

[South8028]

I'm trying to animate a horizontal bar. For animation, I respectively need 3 hkx files (input, main animation, output). To avoid abrupt transitions between animations, it is most convenient to cut these 3 hkx from one single animation. Accordingly, I remove the extra keys, then shift the keys to the zero frame and export these 3 hkx separately. But in the second and third hkx, an incomprehensible error always occurs. Root falls along the Z axis by an arbitrary amount. Moreover, with each export, this value is different. If you do not cut the animation, then there is no such problem. However, doing an animation for each hkx from the beginning is extremely inconvenient.Does anyone know a solution to this problem, or maybe there is at least a theory why this is happening?

https://disk.yandex.ru/i/v9tB8xFgv9Cx_Q