Since this seems to come up...a lot...
Loosen the nut circled in Green...in all likelihood, your hyperloop ramp will actually "pop up" releasing the tension it was under causing it to have the bricks. If not, adjust up (or down, but usually up) as needed to allow the ball to clear the upper part of the hyperspace loop as it enters the death star. If the ball gets kicked out after going around the loop once...you went too far up.
There is also a Facebook post by Ritchie that is linked on this thread somewhere where he discusses this adjustment and the one for Tatooine. (Edit, unfortunately, it seems Stern deleted that video...probably something to do with where he is currently employed...)
death star adjust (resized).jpg