I've never seen this, but from what I can find on Google it seems that error means one of two things: 1) That's your WAN IP 2) You have a static ARP entry for that IP
Then something else is coming online trying to use that IP, or possibly someone on your ISP's network is attempting some sort of ARP mischief.
Is that MAC address from any of your gear? The vendor of that MAC is D-Link.
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