Actor Jumping Effect

I made a jump effect for an actor when space is pressed, and I placed 4 boxes around the whole scene (the scene is divided in 9 images), and made an effect that when the actor is colliding with the box he bounces...when I press space he jumps, and has a nice effect, but at the beginning of the scene the white boxes drop down slowly and the actor also begins dropping out of the scene until they both disappear.,,,WHY IS THIS? the jump effect works
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