OS update 10.3 keeps reverting to 10.2 on VM

I run HA on a VM (VirtualBox), normally works well but I find that when I run the update of the OS to 10.3, the VM ends up going back to 10.2 after a full reboot say a week after the update. Not sure why it keeps doing this but I have installed 10.3 over 6 times now.

The system clearly says it is 10.3 when it restarted after the update but over time it will end up back at 10.2

Anyone else seeing this?

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Hello, this is happening to me with some slight differences.
I am running HA on an odroid M1
Installation of OS 11.0 keeps reverting to 10.5.

Anyone can help?