I hate to add to your headache, but multiple pihole ad blacklists contain your domain. It looks like https://winhelp2002.mvps.org/ may be the original source of the blacklisting.
cat /etc/hosts |grep -i 'jsonip.com'
0.0.0.0 jsonip.com
0.0.0.0 www.jsonip.comNow it's a headache for a different reason.