What's up with Futures closing prices?

Sep CL contract last traded @$79.82 5:00pm today. Next thing I know, closing price is $80.09, which last happened around 2:30p. Works for me as I'm long but WTF?
Is it VWAP? Or is it some dude in Chicago pulling a price out of a dark place depending how his book looks like?
Anybody knows the rules?
TIA

 

Yes, we know the rules.

 

closing price is $80.09

--->

Settlement price is $80.09

 

Last:79.82
Settlement:80.09

 

Thx Bro, learned something tonight.

 

https://www.cmegroup.com/markets/energy/crude-oil/micro-wti-crude-oil.settlements.html

 

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Good;
looked @ both of those. Same way sometimes with ETFs.
I like the lower number, not because it going down as i note this. Or more distant contracts going down.........
I like the lower number[more bearish, less price shocks]= more conservative.
Rules are subject to change.
[But i allow 1% slippage in any market, seldom disappointed on that LOL]