Our house has a Hip roof where the rafters are supported at their very ends by cantilevered ceiling joists on two sides of the house, and by 3 foot "blocking" nailed to the last ceiling joist on each of the remaining sides of the house(Like a Gable end roof). The joists/blocking form the soffit outside and the rafters are not touching the bearing walls at all. Where the rafters are supported by the short blocking, the weight of the roof is forcing the eaves down, and in turn, lifting the last ceiling joist inside the bedrooms, which they are attached to perpendicularly only by nails. I have begun remodeling for our new baby, and discovered this problem after gutting the room. Before realizing what was actually going on, I was just planning on scabbing a straight board onto the side of the joist that was raised in order to bring it down even with the others so i wouldn't have a wavy ceiling... But I think a bigger fix may be needed. Any suggestions would be great!