I noticed that "Buffy the Vampire Slayer TV" is in the tagset, which Ao3 appears to be pinging as different than "Buffy the Vampire Slayer (TV)" and putting under uncategorized. If someone nominates under the canonical tag "(TV)", it'll end up with duplicates in the tagset. It'll also may be hard to find because it's a TV show that isn't under the TV show header.