Have you guys ever had an ARP issue like this?

We have a Wireless Lan Controller with 6 APs attached to it. The WIFI in the building stopped working last week. Investigating it, I found that the IPs that belong to the WLC had the MAC address of a servers ILO port associated with it in our core switches ARP cache. I cleared ARP cache on the core and everything cleared up and it hasn't happened again since then. Still though, it was very weird. The particular ILO was configured with a static IP yet it's MAC was associated to 3 IPs in ARP on our core (It's own IP and the two belonging to the WLC).