Android. Paging Source return same data from database

I'm trying to retrieve paging data from network and database. For this I use paging 3 library.

My problem is that when I start scrolling the list, the requests are sent correctly, but I get incorrect data (the same) from the room database. At the beginning, the data is displayed correctly, but starting from position 70, for example, the database returns the same data.

I tried to find a solution to the problem.

On the stackoverflow, the developers recommended adding a primary key that will be auto-generated and adding sorting by this key. However, this did not help me. Here is my entity:

@Entity(tableName = "tableMovies")
class MovieEntity(
    @PrimaryKey(autoGenerate = true) var pK: Long = 0,
    @ColumnInfo(name = "movieId") val movieId: String,
    @ColumnInfo(name = "movieUrl") val url: String
)

And my dao:

   @Query("SELECT * FROM tableMovies ORDER BY pK ASC")
    fun getAllMovies(): PagingSource<Int, MovieEntity>

Also my entity for remote keys:

@Entity(tableName = "tableRemoteKeys")
class MovieRemoteKeysEntity(
    @PrimaryKey val id: String,
    @ColumnInfo(name = "prevPage") val prevPage: Int?,
    @ColumnInfo(name = "nextPage") val nextPage: Int?   
)

In my RemoteMediator after success get response from network if load type is REFRESH I'm clear movie table and remote keys table. And after I'm adding data from response:

  data.page?.let { pageNumber ->
                            nextPage = pageNumber + 1
                            prevPage = if (pageNumber <= 1) null else pageNumber - 1
                        }

                        val keys = data.movies.map { movie ->
                            MovieRemoteKeysEntity(
                                id = movie .id.orEmpty(),
                                prevPage = prevPage,
                                nextPage = nextPage                              
                            )
                        }
                        remoteKeysDao.addAllMovieRemoteKeys(keys)
                        movieDao.addMovies(data.movies)

My config:

 override fun getMovies( ): Flow<PagingData<MovieModel>> {
        val pagingSourceFactory = { movieDao.getAllMovies() }
        return Pager(
            config = PagingConfig(pageSize = 15, enablePlaceholders = false),
            remoteMediator = MovieRemoteMediator(              
                apiService,
                appDatabase,              
            ),
            pagingSourceFactory = pagingSourceFactory,         
        ).flow.map { pagingData ->
            pagingData.map { movie-> mapper.mapToModel(movie) }
        }
    }

Please help me. I did everything according to the guide, but at some point the database returns the same data to me, despite the fact that I receive a new portion of data from the server. Also visually it looks weird, the list starts jumping.

P.S. I also looked at the contents of the tables in the database. The data was added correctly, according to the portions received from the server.