After seeing the FDA warning, I pinged my wife to get her to check our PB. It turns out that a jar we got to make PB cookies for a Sunday School party was part of the batch. The party was actually a couple of weeks ago and we ended up not making those PB cookies anyway. When my wife found the jar, the bottom of it had expanded so that it wouldn't sit flat and the top was mis-shapen some. My wife said that the bacterial gases could have done that to the plastic. She has the chemistry degree, so I take her word on that. Also, my in-laws had a jar.