As below my floor boards in hall have warpped I also noticed a small warp in the bedroom . On top of this one small portion of our chimney
breast is moulding and the artexed is chalk???
our ground is clay so in the heavy rain the water will sit on top some times
So now you know you have a moisture problem. Next is to find it and fix it. Do you have a crawlspace or basement? Are there gutters with downspouts leading the water at least 15 feet from the foundation? If you run your bath fan 24 hours a day it will help remove some of the moisture until you can resolve the root problem. run dehumidifier in the area where the wood is buckled, it may help.