Separate local user from IP Address

Hi, I need help with a potential attack on my website. There is someone that has somehow attached their ip address to my credentials so now sometimes when I am logged in I get logged out as i have the other IP on a blacklist. I have a screenshot that helps. Please if anyone knows how to mitigate this thanks in advance.

Possibly because your computer has two IP addresses. One IPv6 and another IPv4. Check your IP addresses on any “what is my IP address” website.

Okay, I looked up my IP address and only the IPv4 is showing. It looks like no IPv6 address was detected for me.

I also have another screenshot showing the rouge IP address in question

What is bugging you? Change you password if you think it was stolen. To see more details, click that IP address.