I'm not sure if I understand. What's the end frame? What's the start frame? When I copy the root's hierarchy animation from frame 0, and paste it on frame 61, they look the same. However, as you said, as you scrub through, the character is not static as would be expected. This is because the original keyframes had animation tangents applied to them. To fix this, simply select your entire timeline, then right click, go to Tangents, and click Flat.