Australia Post Calculator - incorrect rates?


I am curious to know if anyone else has come across this issue where the Australia post shipping calculator in v4.0.3 is generating inconsistent rates compared to that on their ‘Postage Calculator’ on austpost website…

Postage calculator & delivery times - Australia Post

Is there a bug or a fix for this or is it just me?

I understand aussie post have just updated their rates as of 7 October.

I am using the ‘Australia Post Regular Parcels’ service, however the other service calculations are also incorrect.

Any help or direction will be appreciated from my fellow aussie users/developers.