Sorting and pagination issue

System Information
  • Strapi Version: 3.6.8
  • Operating System: ubuntu
  • Database: ysql
  • Node Version: 14.x
  • NPM Version: 6.x
  • Yarn Version:

I have a collection named articles, and it has a field named last_post_date. I tried to query it with following sorting and pagination from specific date period “articles?last_post_date_lte=2021-09-21&last_post_date_gte=2021-09-16&_sort=last_post_date:DESC&_start=0&_limit=5”, which returned successfully, but after the first page, the rest might get duplicated articles from previous page or repeated, wanna know why.