Reply To: Planed board strange behavior.
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I’ve had the same thing, particularly if I’ve reduced the thickness a lot. From doing some research, I found that it’s likely due to 1) the wood wasn’t dried all the way through, so when you expose the internal wood with the higher moisture content it starts drying and cups again, and 2) planing off a lot relieves internal stresses which allow it to move again (similar to when ripping.)
What I usually do is 6-square it and leave it a bit thicker than needed (just enough so if it cups/twists I can take it out again), then sticker it until I get around to actually using it, then I bring it down to final thickness and take out any cup if it came back.
Tom