OK so I know this thread is really old, but since I had this issue too, I thought that maybe it could be helpful to give my take on this.
You don’t necessarily need to go in a 3D modeling software to fix this, you can do it inside Unreal. So, just open your animation sequence and in the details search for FORCE ROOT LOCK, and tick it.
This solved it for me, everything is in its correct position. And it’s way quicker.
Cheers!