Viewer/editor/etc is a Google thing and shouldn’t be related to whatever you’re experiencing here. Please note that if your notes have multiple cards, Anki can not export a subset of the cards. So if your notes have cards spread across decks a, b and c, and you export deck a, you’ll end up with deck b and c as well. Does that explain what you’re seeing?
If not, is your content uploaded to an AnkiWeb account? If so, please let me know the steps you’re taking to export the file, so I can try to reproduce the issue when importing into a fresh profile.