Perhaps the ticket was actually for $944.93?
Webjet probably has an agreement with ANA where they can sell the ticket for $733 (net fare as per contract they have with ANA) plus a markup of $211.93.
The reason why it probably showed up as "IATA Charge" is because the "service fee"module of Webjet's GDS was not properly setup. When properly setup, the charge should have showed up as "Webjet".
Also, it might be possible that their website incorrectly showed the "net" price that they have with ANA.