A good practice if you have to store lumber for any significant length of time: Keep boards off the ground if possible, stack them high, and put a few narrow 1/2” strips of wood between boards to allow airflow. Add weight to the top. Cover with a tarp. The weight of the stack keeps everything flat as the wood fibers expand and contract. The spacers (called stickers) allow air to flow between boards and keep the moisture content even. If one side of the board has more moisture than the other side it will expand and warp the board badly.
Treated lumber is usually very wet when it comes from the lumber yard. Thats why it is so heavy and feels cool to the touch.
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