This content is for my domain https://firebog.net as well as my Big Blocklist Collection.
pihole -q blockeddomain.com, and it will return the URL of the block list.
Click on the big blue "Toggle List Maintainer Sources" button to show the source of a particular blocklist. Via the source page, you should be able to find the contact details for the list maintainer. Get in touch with them to remove the false positive - if you're not able to find the maintainer's contact details, please feel free to get in touch with me.
Open a ticket here, and I'll be happy to see what I can do.
I attempt to reply to GitHub tickets and mentions as soon as soon as I notice open tickets, so by all means please ping me anywhere else that I frequent that's convenient for you. Also note that if a ticket is closed, you are definitely welcome to comment on it still if you have any question, comment or concern. 😃