Wood is going to cup, twist and warp, it is not a static product. It will move, it will swell, it will shrink...noticably. Buying kiln dried lumber will help reduce this, but it still is going to do this somewhat as the level of moisture in it changes. Use it as soon as you can after you buy it, get it sealed as soon as you can. You want to acclimate panel products, and rough lumber that you are going to be milling. But kiln dried studs/joists should not require acclimating at all.
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