We air dry and kiln dry our wood to reach a 47% humidity level before they are built. However, because our guitars are multi-piece guitar bodies, that have 3-5 pieces glued together to create the body, as the wood ages it tends to move towards having less internal moisture and decreases in its overall size. A brand new guitar from any manufacturer can be made years before they are actually purchased so over that time they might naturally lose some of that moisture and because they are multiple board pieces they might lose that moisture at slightly different rates and amounts depending on where the wood pieces are located on the body, how big they are, and how exposed the wood is to the air. This can create a height difference in the surface of the guitar and that difference can be shown in the paint and lacquer. This is a normal aging process that happens with every guitar. Even one piece bodies are affected by this aging process, to a lesser extent, with knots, wood locations, exposure, and wood and grain thickness. E.G. a wood knot will not shrink as much as it is more dense than its surrounding unknotted wood and create a height difference.