Why the network interfaces have a MAC from Realtek instead of Intel?

My Seeed Studio Odyssey X86J4105 network interfaces have MAC addresses (00:e0:4c:01:93:a8 and 00:e0:4c:01:93:a9) from Realtek instead of Intel, but why is that?

We bought a lot of realtek mac address and we change ours mind to use intel NIC at the end.