@Albelel said:
Wrong ID for Alvin and the Chipmunks
/multi / movie search returns this id for Alvin and the chipmunks (first movie): 2160
But when i use movie details the api returns "Voyage to the Bottom of the Sea" for this id.

Alvim is a TV Show, not a Movie.
https://www.themoviedb.org/tv/2160-alvin-and-the-chipmunks
https://www.themoviedb.org/movie/2160-voyage-to-the-bottom-of-the-sea
They both have the same ID.

The list of IDs are separate, different.

For example, ID 500:
https://www.themoviedb.org/movie/500-reservoir-dogs
https://www.themoviedb.org/tv/500-mad-about-you
https://www.themoviedb.org/person/500-tom-cruise
https://www.themoviedb.org/network/500
https://www.themoviedb.org/company/500

You can discern the difference between each media type
by looking at the media_type field returned with each object.