Dhcpv6 server unknown leases

[MyMrRobot]

2.4.2-RELEASE-p1

Sorry NOOB question

Running DHCPv6 server with router mode assisted RA Flags

First off none of my devices are registered in DHCPv6 Leases but my AP even though all my devices that have ipv6 get there addresses on the devices so it serving but not registering them, not too big of a deal.

But what concerns me is that under the DHCPv6 Leases page I have several leases that don't belong to any device I have. 3 have fake MAC addresses, and one doesn't even have a MAC at all.

Is this normal?