Hi, @rylandg, we can unlock the NETLIFY/NETLIFYv6 records and there is more information about this here:
My best guess is that someone unlocked these for you. I’ve made sure all the NETLIFY/NETLIFYv6 records currently present for this domain can also be deleted (if you want to - you don’t have to).
If there are other questions or concerns, please let us know.