Received conflicting ARP on interface ethernet

[cdcirexx]

Hi all, after exporting the old config from my old pa500 to the 820, I had an old interface that was for my  wifi vlan, that used to be a physical int on the 500 but I needed to remove it since now the 820 only has 4 ethernet ports, I reset it as a sub-int on the 820, but now I'm getting this message "Received conflicting ARP on interface ethernet1/1.60 indicating duplicate IP 172.16.xx.xx, sender mac 58:49:3b:a0:a6:14"

I could not find where this mac address is, we still have our old unifi system that was in the wifi vlan, but I shutdown the ssg pro4, and only have an old acpro that's not in that vlan anymore, I cleared all the switches arp's and somehow this mysterious mac address keeps popping up on one of the switches and is showing up on the pa820 logs. Anyone seem this before or have any ideas, thanks in advanced.

[cdcirexx]

About the dhcp, I'm using the built in dhcp on my aruba iap

[cdcirexx]

Another thing, that mac address also shows up on one of my cisco sg300 switch that's on another bulding, I had our old unifi ap hooked up to that switch before, I took it down already and tried to clear the arp table on the switch as well.

[cdcirexx]

Figured it out, our old pa500 was still hooked up on the core switch, your right it was a pan mac address, it was int1/5 of the pa500, I unplugged it and the messages went away. Can't believe I missed that