On Wednesday, June 10, 2020 at 2:26:51 PM UTC-5, DerbyDad03 wrote:

That's the largest of a set of 3. The other 2 are beginning to warp also.

Light weight and SWMBO likes cutting on them, but obviously they have issues.
It's still interesting that they all just started warping at the same time.

There's more humidity now than during the winter, which is when they were
bought. I'm going to blame it on that.

The cause is because of one circumstance: one side has cupped or one side has expanded. With the board that is least used, either place it in the sun or dampen as noted above. If for some reason the "fix" totally fails, ruining the board, you'll still have 2 other boards for usage.

Sonny