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NotThamesWater
Random thought on this. I think most modern mobiles and Rapsberry Pi tend to use locally generated (spoofed) mac addresses now days. These can change when you update/reimage a system. I know my Galaxy s10 changes mac addresses after major updates. Pretty sure my Pi4 devices do too. I could be wrong though, its not something I've paid attention to.
If your DHCP lease was still valid, it might detect an upgraded device as a new device if the Mac has changed hence the new DHCP lease.