Jellyfin shows tags that isnt in my medias?

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Jellyfin 10.9.2 official docker on a headless Intel NUC N5105 with Debian 12
- Library is read only, so jellyfin cant edit/write the/to data in the folder where the library is set.

I've created a library for Movies to get metadata down in the media folders, and then moved the media to another folder with another library (Locked by Docker with :ro in the .yml file).
Then i've edited in the .nfo files for each movie, so <tag></tag> has a "#" in front of each of their lines and then added my own <tag>Example</tag> (For now just one to test on a few movies)

But, when i go to the library and choose filters > labels there is shown tags that isnt in the .nfo files.

Is this a bug or am i missing something?