Labels are wrong

What exactly do you mean by ‘labels’?
Movie titles? Or other metadata?

Start with this:

preparation

Go to

  • Settings - Server - Agents - Shows - TheTVDB

In there, grab the line ‘Local Media Assets’ with your mouse and drag it downwards, so it ends up being at the bottom of the stack of active agents.
Repeat the same under

  • Settings - Server - Agents - Shows - TheMovieDatabase
  • Settings - Server - Agents - Movies - Plex Movie
  • Settings - Server - Agents - Movies - TheMovieDatabase

file names and folder structure

https://support.plex.tv/articles/categories/media-preparation/

After checking file names and folder structure, perform the Plex Dance