One more thing to try then, is on the “unformatted” curly bracketed document, “convert to plain text” – then do your view field contact shift F9 - and see if they are all “gone”. (this should not affect your page numbers, table of contents, etc fields, which will still appear as gibberish).
Now try to reformat? What style are you using?
Try formating with a different style – still two bibliographies? - No? then switch back.
let me know the outcome!