That happens because the player gets teleported to the end CFrame before the animation fully stops. It “smooths” back to the original position of the animation, for a certain duration.
Either the root part needs to move by itself to the end location throughout the animation, which you’d have to implement yourself since Roblox does not do it natively, or, there’s some other way to make that section where the animation fades back to normal be very very short.
You could also try this? I will test it and see if it works. It does not. But you could try this resource or this one.