Three year seasoned white oak. Not seasoned in the best conditions although a fall moisture reading showed 20% or less. I began to use from this pile and notice some sizzling going on. I was actually going to move this pile to a better location but decided to take another moisture sampling. Just took a sample of the biggest pieces (not large at all, bicept size split branches). Samples 20% and under. Whats up with the sizzle? Is this something oak does? These are split branches with the bark still holding on. Is it the moisture from the bark?