Double images

index.js
import logo from './logo.svg';
import './App.css';
import { useEffect, useState } from 'react';

function Card({ wallpaper }) {
  const { urls: { small }, slug, id, alt_description, user: { username, profile_image: { medium } }, description } = wallpaper;

  return (
    <div className="card" key={id}>
      <div className='card-container'>
        <img src={small} className='image-url' alt={alt_description} />
        <span className='owner-profile'>
          <img src={medium} className='owner-profile-image' alt={`${username}'s profile`} />
          <span className='owner-name'>{username}</span>
        </span>
        <div className='wallpaper-details'>
          <span className='card-title'>{slug.replace(/-/g," ")}</span>
          <small className='card-description'>{description}</small>
        </div>
      </div>
    </div>
  );
}

function App() {
  const [wallpapersList, setWallpapersList] = useState([]);

  useEffect( () => {

    async function load () {
      let fetchData = await fetch('https://api.unsplash.com/photos/?client_id=ACCESS_TOKEN')
      let fetchedJSON = await fetchData.json()
      setWallpapersList(prev => [...prev , ...fetchedJSON])
    }
    load();

  }, []);

  return (
    <>
      <h1>Wallpapers</h1>
      <main>
        {wallpapersList.map((wallpaper) => (
          <Card key={wallpaper.id} wallpaper={wallpaper} />
        ))}
      </main>
    </>
  );
}
export default App;


When the site loads I have to get 10 images instead getting 20 images
Another 10 images are same as the first 10 images
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