That's likely because you are asking the api for a paginated list of posts/comments. When you request page 1 at one point and page 2 at a later time, the list of posts can change inbetween, so posts that were part of page 1 have now been pushed down into page to, so you get them again when loading page 2. The solution is to keep a list of post ids that are already in your list of posts and don't load those again, same with comments.
this post was submitted on 23 Jun 2023
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Ah smart. I fixed the issue by sorting out duplicate post ids before displaying my list of posts
That's exactly what I meant to say ;-)