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MAC of multiple virtual machines change

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arp -a output shows the following

Code:
ipxxx.ip-51-89-201.eu (51.89.201.xxx) at fe:ed:de:ad:be:ef [ether] on vmbr0

After rebooting the VM (MAC returns correctly)

Code:
ipxxx.ip-51-89-201.eu (51.89.201.xxx) at 02:00:00:9b:81:48 [ether] on vmbr0

What could be the cause of this? It seems to happen to multiple machines at the same time and always the same MAC this time fe:ed:de:ad:be:ef (fe:ed:de:ad:be:ef is not on any interface)

Code:
auto lo
iface lo inet loopback


auto enp193s0f0
iface enp193s0f0...

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