Yes they are warping and that was the point behind turning them that thin about 3/8" on the larger and a 1/4" on the one with a rim. My wife loves the movement, she says it adds to the natural beauty of the wood.
Joebobber , my son took home 2 bowls, both live edge. Those were twice turned and dried in desiccant. They were from the last load he brought to me. On his next trip he asked if I could turn him a live edge bowl about 30" and I told him we will try but it would probably be a little smaller.