Quality control.  The first sofa material was badly flawed and  had very wrinkly crushed fabric on the arms.  This was replaced and second one also had a fault which we ended up rectifying ourselves. It was very difficult to line up the screw holes to attach the back.  Bought for our garden room, don't know how it would stand up to heavy daily use.  
Great size for small room and looks quite nice  but not the most comfortable.