Why do R720 POE Port show two MAC addresses?

unknown

We have a NAC solution on my network and I recently deployed a few
R720's. I noticed that all ports where the 720's are connected show two
MAC addresses. I compare the MAC address entries for all other AP's and
they all show one MAC. Port Gi1/0/44 has an R720 and port Gi1/0/45 has
an R710. No clients are connected to them.

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
 1    ec58.ea1a.e360    STATIC      Gi1/0/44
 1    ec58.ea1a.e364    STATIC      Gi1/0/44
Total Mac Addresses for this criterion: 2

-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
  1    348f.2724.a7a0    STATIC      Gi1/0/45
Total Mac Addresses for this criterion: 1