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Thank you for your input. I understand what you are saying, but I'm talking about raising the temp to over 400ºF, and then when it is exposed to air, the oxidation takes place very rapidly. If I quench the temp, there is no rancidity detectable.
So it is fresh, virgin coconut oil that has never been used before?
(I might try and see if I can reproduce what you are experiencing).
I'm curious - why do you get your coconut oil well past smoking hot to cook your popcorn?