[DuckDuckGo Search API] Duplicate results obtained on different pages

[sonika-serpapi]

A customer reported seeing duplicate results on different pages of the same search in DuckDuckGo Search API and DuckDuckGo News API.

DuckDuckGo Search API:
Customer shared two pages of a search where they saw duplicates:
Search page 1: https://serpapi.com/searches/67898f9635bad4ed817a7911/inspect
Search page 2: https://serpapi.com/searches/67898f977726dca50c47262f/inspect

DuckDuckGo News API:
Here is a diff I put together for first 2 pages of a particular query:
https://www.diffchecker.com/J78eXqfw/

Page 1: https://serpapi.com/playground?engine=duckduckgo_news&q=Coffee&kl=us-en
Page 2: https://serpapi.com/playground?engine=duckduckgo_news&q=Coffee&kl=us-en&start=13

https://scitechdaily.com/morning-coffee-timing-linked-to-longer-life-and-better-heart-health/ repeats on both pages.

Internal links: Front