I have tested your request.
On page 1 I did not find any duplicates.

10437 The Muppet Christmas Carol  
5590  Donkey Skin  
94352 Cirque du Soleil: Worlds Away  
6116  Spice World  
266639 Jem and the Holograms  
13501 The Good Night  
64847 Belladonna of Sadness  
553195 Portrait of a Knight  
40423 Black Orpheus  
70690 Cinderella '80  
241287 Tropico  
37209 The Saddest Music in the World  
42464 O Lucky Man!  
41426 Jubilee  
44502 The Piano Tuner of Earthquakes  
16641 Cirque du Soleil: Journey of Man  
47060 The Hole  
9596  Daniel, the Wizard  
37711 Princess Raccoon  
545292 The King & I: from the London Palladium  

On page 3 I came across the similar name.

426471 A Christmas Carol  

Can you be more specific?
Inform the ID of the duplicates and on which page are they?

Sorry that i was not specific in the first post. My problem looks like this:

When I send this request
https://api.themoviedb.org/3/discover/movie?api_key=...&page=3&language=en&with_genres=14,18,10402
API response is not consistent, i get different movies almost every time. Is it supposed to be like this? I thought that i will get consistent results.

This is a results of two requests i sent with 5 second interval:

Request 1

1. {vote_count: 0, id: 470876, video: false, vote_average: 0, title: "Aquarius", popularity: 0.6,…}
   
2. {vote_count: 1, id: 497188, video: false, vote_average: 5, title: "Um Panda da Pesada",…} .
3. {vote_count: 0, id: 560073, video: false, vote_average: 0, title: "Swansong", popularity: 0.6,…}
   
4. {vote_count: 0, id: 457573, video: false, vote_average: 0,…}
   
5. {vote_count: 0, id: 390212, video: false, vote_average: 0, title: "The Bionic Girl", popularity: 0.6,…}
   
6. {vote_count: 0, id: 43733, video: false, vote_average: 0, title: "Orpheus in the Underworld",…}
   
7. {vote_count: 1, id: 22750, video: false, vote_average: 5, title: "The Blood of Jesus", popularity: 0.6,…}
   
8. {vote_count: 0, id: 61736, video: false, vote_average: 0, title: "Die Eisprinzessin", popularity: 0.6,…}
   
9. {vote_count: 5, id: 138720, video: false, vote_average: 3.6, title: "Superman", popularity: 0.6,…}
   
10. {vote_count: 0, id: 220825, video: false, vote_average: 0, title: "The Committee", popularity: 0.6,…}
    
11. {vote_count: 0, id: 283125, video: false, vote_average: 0, title: "Alice", popularity: 0.6,…}
    
12. {vote_count: 2, id: 333409, video: false, vote_average: 10, title: "Trentemøller: Gravity",…}
    
13. {vote_count: 0, id: 413563, video: false, vote_average: 0, title: "Acrylic", popularity: 0.6,…}
    
14. {vote_count: 0, id: 320445, video: false, vote_average: 0, title: "Happiness in August",…}
    
15. {vote_count: 0, id: 340774, video: false, vote_average: 0, title: "Neel Kamal", popularity: 0.6,…}
    
16. {vote_count: 0, id: 421033, video: false, vote_average: 0, title: "Madame Esmeralda and the Audition",…}
    
17. {vote_count: 1, id: 426471, video: false, vote_average: 1, title: "A Christmas Carol", popularity: 0.6,…}
    
18. {vote_count: 0, id: 274861, video: false, vote_average: 0, title: "Molly Takes a Trip",…}
    
19. {vote_count: 0, id: 299869, video: false, vote_average: 0, title: "Kurukshetramu", popularity: 0.6,…}
    
20. {vote_count: 1, id: 372789, video: false, vote_average: 6, title: "Her Composition", popularity: 0.6,…}
    

Request 2

1. {vote_count: 1, id: 22750, video: false, vote_average: 5, title: "The Blood of Jesus", popularity: 0.6,…}
   
2. {vote_count: 0, id: 560073, video: false, vote_average: 0, title: "Swansong", popularity: 0.6,…}
   
3. {vote_count: 0, id: 457573, video: false, vote_average: 0,…}
   
4. {vote_count: 1, id: 497188, video: false, vote_average: 5, title: "Um Panda da Pesada",…}
   
5. {vote_count: 1, id: 426471, video: false, vote_average: 1, title: "A Christmas Carol", popularity: 0.6,…}
   
6. {vote_count: 1, id: 435123, video: false, vote_average: 7, title: "Sree Ayyappanum Vavarum",…}
   
7. {vote_count: 2, id: 432373, video: false, vote_average: 7, title: "A linchpin", popularity: 0.6,…}
   
8. {vote_count: 0, id: 435405, video: false, vote_average: 0, title: "Santos Vega vuelve",…}
   
9. {vote_count: 0, id: 492189, video: false, vote_average: 0,…}
   
10. {vote_count: 1, id: 410140, video: false, vote_average: 8, title: "Clamp in Wonderland 2",…}
    
11. {vote_count: 0, id: 470876, video: false, vote_average: 0, title: "Aquarius", popularity: 0.6,…}
    
12. {vote_count: 0, id: 421033, video: false, vote_average: 0, title: "Madame Esmeralda and the Audition",…}
    
13. {vote_count: 0, id: 537959, video: false, vote_average: 0, title: "Taste of Night", popularity: 0.6,…}
    
14. {vote_count: 0, id: 43733, video: false, vote_average: 0, title: "Orpheus in the Underworld",…}
    
15. {vote_count: 0, id: 187657, video: false, vote_average: 0, title: "Prom Night", popularity: 0.6,…}
    
16. {vote_count: 5, id: 138720, video: false, vote_average: 3.6, title: "Superman", popularity: 0.6,…}
    
17. {vote_count: 0, id: 320445, video: false, vote_average: 0, title: "Happiness in August",…}
    
18. {vote_count: 0, id: 340774, video: false, vote_average: 0, title: "Neel Kamal", popularity: 0.6,…}
    
19. {vote_count: 0, id: 380814, video: false, vote_average: 0, title: "Angels vs. Bullies",…}
    
20. {vote_count: 0, id: 390212, video: false, vote_average: 0, title: "The Bionic Girl", popularity: 0.6,…}
    

Movies appear in different order and in the first response there is a movie with id 61736 when in the second response there is no movie with id 61736.

I know what is going on. I get inconsistent result because i'm not specifying sort_by parameter. For some reason i thought that API by default will use sort_by=popularity.desc if i'm not specifying anything.

So my problem is solved! But anyway, thank you for your response @ticao2.