How to Replace an Existing Raised Garden Bed
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Saying that pressure treated lumber is okay for raised beds because not that much leaches into the soil is like saying using concrete-asbestos siding is okay because not that much asbestos blows away in the breeze. A real possibility of harmful chemicals affecting gardeners is the contact with the wood, kneeling on or near the wood, rubbing skin against it, getting scrapes and splinters that cause some of the material to enter the skin. This happened to school staff making and repairing playground equipment and bleacher seating made with PTL, and receiving very nasty wounds and irritated areas that required extensive treatment. Sawing and inhaling the particles is harmful too. The material was banned for a good reasons. Don't pooh-pooh the prohibitions or tell people it's okay because it doesn't harm soil that much and there isn't that much uptake in the vegetables!
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I use the largest truck tires i can handle and put landscapers cloth inside. They last forever and i can start earlier and grow later as the tires keep the soil warm I stack two to get the depth i need for various plants. Tires are free from local garage!
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What were the measurements of your beds? Wouldn't it be possible to eliminate warping by putting some stakes in the ground at regular intervals and screwing the lumber to them?