A huge delay with my last renewal because their "system" wouldn't recognize my West Australian Birth Certificate (the same one I've always used for this and my passport)! To their credit, at least they kept me informed....
What has happened is that the system now uses the government's document verification service to electronically match the data with the details of the certificate . So for years you might have been using your document and it is perfectly legit, however now because of some glitch or data error in a state's BDM registry there is no match and your ASIC application comes to a complete halt.
There are problems with quite a few of them.