Odd behavior resetting Dream Machine

The strangest thing just happened. I updated and reset a Dream Machine with new admin user, wifi etc. ( reset to ‘factory default). However, when I went to use a mobile device, all of the old settings appeared (ie wifi antenna, old password, etc). A secondary antenna (unifi-ac-lr) was connected to the DM and could not be joined to the system (did not have the old credentials), and don’t know if this is causing the particularly strange issue. Any comment would be appreciated. Thanks.