Here is an example of a duplication of a Factbook tag in the pick list. "Reformation Era (1517-1699)" appears twice. As far as I can see they are the same.
They have been being reported here Duplicate entries & typos in Factbook: list here - Faithlife Forums (logos.com) . The method used to create the original Factbook entries results in duplicates which have not all been identified and resolved.
Thanks. I found others as well. I will check that list and possibly add to it.