I agree too. Contact the cuemaker. There are alot of cues with warped butts. I have worked on alot of high end cues that had a warp in the butt of the cue. Wood can move no matter how many precautions you take. The majority of the cues with warped butts that I have seen have been warped in the handle. Some cuemakers don't clear coat the handle area. the handle is covered by a wrap in alot of cases, but this is constantly taking on moisture from your hands, and just the enviroment. Any time that you allow wood to go unsealed, you take the risk of it taking on moisture which can lead to it moving. It is the same with shafts, if the sealer is sanded off the shaft has a greater chance of moving than a shaft that has been sealed. But it all depends where the cue is warped. It is important to remember that would is a natural thing. You don't see many trees growing perfectly straight. This is just another downside to using the natural materials that a cuemaker has work with. But again, a cuemaker can take every precaution imaginable to prevent against this, but it still doesn't mean the wood won't move in time. These are just some examples of why and how a cue can warp. I hope this helps a little.