I'm using https://api.themoviedb.org/3/movie/18/account_states?api_key=###&language=de to get the states, it works well for other movies like 603 and 19959, but for some movies like 18 it gets the favorite state for my personal account "cyman" wrong (false instead of true). I'm just a bit confused how this can happen?

{
  "id": 18,
  "favorite": false,
  "rated": false,
  "watchlist": false
}