This is the repo for my Big Blocklist Collection.
Run pihole -q -adlist blockeddomain.com, and it will return the URL of the block list, opposed to list.X.*.domains.
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.
Open a ticket here, and I'll be happy to see what I can do. Frustratingly, I don't regularly get GitHub notifications from my own repo - so feel free to ping me via any listed contact method.