I am using popular movies request (/3/movie/popular) with pages (/3/movie/popular?page=1, /3/movie/popular?page=2 etc.) and API returns same movies on different pages.

curl --request GET \
     --url 'https://api.themoviedb.org/3/movie/popular?language=en-US&page=1' \
     --header 'Authorization: Bearer  TOKEN' \
     --header 'accept: application/json'

Response ends with

{
  "page": 1,
  "results": [
    .... SOME MOVIES HERE ...
    {
      "adult": false,
      "backdrop_path": "/i1Lx1Whonfh8awXkYx3bGinK2V8.jpg",
      "genre_ids": [
        28,
        53
      ],
      "id": 872542,
      "original_language": "en",
      "original_title": "Agent Game",
      "overview": "Harris, a CIA interrogator at an Agency black site, finds himself the target of a rendition operation after being scapegoated for an interrogation gone horribly wrong. As the team tasked to bring Harris in begins to question their orders -- and each other --Olsen, a senior intelligence officer, and his subordinate, Visser, raise the stakes. Now, it's up to Harris and some newfound allies to uncover the truth and turn the tables.",
      "popularity": 501.754,
      "poster_path": "/qXJFjgcV7ESRHUSxZiBA4PzRMIx.jpg",
      "release_date": "2022-04-08",
      "title": "Agent Game",
      "video": false,
      "vote_average": 5,
      "vote_count": 74
    }
  ],
  "total_pages": 42872,
  "total_results": 857421
}

and the second page

curl --request GET \
     --url 'https://api.themoviedb.org/3/movie/popular?language=en-US&page=2' \
     --header 'Authorization: Bearer  TOKEN' \
     --header 'accept: application/json'

starts with same id 872542

{
  "page": 2,
  "results": [
    {
      "adult": false,
      "backdrop_path": "/mOQV573Tr0WxI2VVOLKwtfaRGZH.jpg",
      "genre_ids": [
        10749,
        35,
        12
      ],
      "id": 949429,
      "original_language": "th",
      "original_title": "ผจญภัยล่าขุมทรัพย์หมื่นลี้",
      "overview": "Joy, a secretary at a large multinational company, has an online shopping problem, likes to read adventure novels and watch travel and adventure shows. She daydreams about living a life of adventure.",
      "popularity": 511.393,
      "poster_path": "/z3SeS4wjKQ3TjHSvRidovGJbHYb.jpg",
      "release_date": "2023-12-22",
      "title": "The Adventures",
      "video": false,
      "vote_average": 6.364,
      "vote_count": 11
    },
    {
      "adult": false,
      "backdrop_path": "/i1Lx1Whonfh8awXkYx3bGinK2V8.jpg",
      "genre_ids": [
        28,
        53
      ],
      "id": 872542,
      "original_language": "en",
      "original_title": "Agent Game",
      "overview": "Harris, a CIA interrogator at an Agency black site, finds himself the target of a rendition operation after being scapegoated for an interrogation gone horribly wrong. As the team tasked to bring Harris in begins to question their orders -- and each other --Olsen, a senior intelligence officer, and his subordinate, Visser, raise the stakes. Now, it's up to Harris and some newfound allies to uncover the truth and turn the tables.",
      "popularity": 501.754,
      "poster_path": "/qXJFjgcV7ESRHUSxZiBA4PzRMIx.jpg",
      "release_date": "2022-04-08",
      "title": "Agent Game",
      "video": false,
      "vote_average": 5,
      "vote_count": 74
    }
.... OTHER MOVIES HERE ....
  ],
  "total_pages": 42873,
  "total_results": 857454
}

Is this behaviour ok for API or I missed something in documentation?