I dunno. I've just tried a test by adding your 'double wine case" to my cart, and I can see that you do have a problem, BUT, the data being sent to the servers appears to be quite valid, so I really can't explain what is going wrong.
What do you get if you click on the following links?
http://drc.edeliver.com.au/ratecalc...._Type=STANDARD
http://austpost.vcsweb.com//ratecalc..._Type=STANDARD
These links are the as as what your server used to obtain a quote on the aforementioned item... deleivery to postcode 2121
You can also try enabling/disable the 'cURL' option to see if that makes a difference.
If still no luck, load the modules/shipping/austpost.php file into a text editor, search for the line that contains "debug = 0", chane it to 'debug = 1', resave, and see if the onscreen debugging text offers any further clues.
It seems to me that your are only able to get valid data from the vcsweb.com server (fixed price items) and that there may be an issue connecting the the edeliver.com server (parcel rate calculations).
Lemme know of your findings (seemingly useful or not) and I'll see if it gives me any other ideas.
Cheers
Rod
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