the only thing i can think of is moisture
a basement may not have been the driest place to store wood
when you remove enough to leave the thin piece that is a forend- you expose the wood from the middle that never had a chance to dry correctly,
i have had boards cup after planning to a thin thickness that i thought were dry
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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