Mattress has a hump in the middle of the mattress that runs from side to side.  As soon as I opened the packing that area was higher than the rest of the mattress.  I assumed that in the 25 hour to 72 hour period that the rest of the mattress would rise.  It has been a week or more and the hump is still there.  We have not slept or even sat on it at this point.  I am not sure if is a spring problem or another problem.