movable object has black baked shadow once object moves

I am learning UE4. I have a question abut movable object casting shadow. Hopefully I can get answer from you guys.

I have baked the shadow in the dynamic boject, but when the object moves, the black baked shadow move alone with it.
My skylight is set to Static.
directional light is set to movable.

how i can make movable object cast a correct shadow that affect on to other object as well.

Thank you