Hi @gregoryo2017,
To make sure I understand the intended setup and issue, you have a domain (DNS zone with regards to BIND) pawsey.org.au, and then you have a delegated zone of nimbus.pawsey.org.au, are either of these the default MAAS domain? And then in one of these , you have an ubuntu.pawset.org.au A record, but then the erroneous empty label record with the same IP?
Additionally, what is that IP tied to? Is it a machine within MAAS? If so, what is the status (i.e is it deployed?)?
I would recommend opening a bug report with these questions addressed there along with what MAAS version you are using, if you can.