API returns duplicate records after pagination

The API returns paginated products using page and limit. When requesting consecutive pages, some products appear in both pages.

For example, page 1 may return products 1–20, while page 2 unexpectedly contains some of the same products from page 1.

The API should return unique records across pages.

const products = await Product.find()
    .skip(page * limit)
    .limit(limit);