What am I misunderstanding about the bonding curve equation?

For the Network FT:

r = fixed at .66 (from docs)

s = 40,000 (auction supply)

P(s) = 688 (clearing price)

x = 44,142 (current supply) 

price should be ~723 with these variables.
But price is 938 on the Airstack site.

What am I misunderstanding?

20000 moxie bounty to whoever explains to me the right things to input into the bonding curve equation. I can match the docs example. I cannot match airstack site.

You get the bounty when I'm capable of formulaically getting the same supply and price values I see on https://airstack.xyz/network

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