That's interesting. I guess oil trading continues after the markets have closed. 
Okay, let me try and explain this.
Yesterday at 2:30PM, the October contract for oil expired. Because of a short squeeze, the October contract shot up to $120+. Starting at 9PM with electronic after-hours trading (not real), they started trading the November contract, which was only at $109.
Oil trades on monthly contracts, gas does not.