Someone seems to have accidentally made Fluffy into an artist tag.

None of the images seem to be made by an artist named "fluffy" but if there is such an artist it really should be "fluffy_(artist)" as a separate tag.

Not sure if there's a way to de-artist a tag, or if an admind needs to do it.

You could do it manually or wait for a mod/admin to take out all the fun by mass-editing Fluffy.

How would I go about doing it manually?

Looks like it's already been done.

http://e621.net/tag?name=fluffy&type=&order=date&commit=Search

I've change it to general tag now. So if you were searching for fluffy arttags:1 now you should search for fluffy arttags:0

Cool, thanks.