arp table - same mac address shows two ip addresses

Linux Advanced Routing and Traffic Control

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(1.2.3.4 is an arbitrary replacement but doesn't affect the basic issue)  What is causing this?  The systems in question have only one interface per subnet but both systems have multiple NICs which are on the same subnets.  What I mean is this:  on both systems NIC1 connects to subnet 1, NIC2 to subnet 2 and so on for five NICs and different subnets.  The subnets do have different IP ranges (no overlap).  10.222.109.3 does happen to be on the same system as 1.2.3.4 but it doesn't have the same mac address and it is a physical interface.

Address             HWType   HWAddress           Flags  Mask   Iface
10.222.109.3     ether          bc:30:5b:a6:c4:bf  C                    eth9
.
.
.
1.2.3.4               ether         bc:30:5b:a6:c4:bf  C                    eth9


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