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Bent Wood Pieces12/8
It sounds as if you made an unbalanced plywood panel. Or took a plywood panel and (unintentionally) unbalanced it by using a different species on each face.
As conditions change, one face/species moves more than the other, causing warp.
Steam or ammonia will not help, I am afraid. The best thing to do is make all panels balanced with the same species top and bottom, same thickness, and same finish.
Yes, I completely agree with the post above that ammonia or steam treatment would be of no help if the wood has got bent or warped. You cannot do anything except changing the different species of wood that have been used.
About all that you can do to salvage the material is glue two pieces together back to back. When you try again with a balanced laminate, make sure it's flat in the clamps/bag.
Below are few links that can be helpful in the matter.
Hope this is useful