Animation bug

If you move the animation to an object on the scene directly from the 3d model in assets, it will look right, but if you copy all the animation frames and paste them into a new animation file and apply a new file with exactly the same animation to the same object, then exactly the same animation will look different. It may be difficult to understand what is meant, so here is an example: Animation bug - YouTube . I need to copy the animation to another file to be able to edit it