I don't know if this answers your question about same posts, but here is info about the sorting algorithm:

https://join-lemmy.org/docs/en/contributors/07-ranking-algo.html

I also see same posts (I am looking at you two toilets in a bathroom) a lot but I think it is just lemmys way to show posts that ppl engage in and I guess two toilets in a bathroom is a very hot/trending topic right now because it doesn't seem to die down 😂

So I usually sort on all and new to find post that is lonely and maybe help them out a bit by commenting :D

I don't think this is a big different from reddit tho, on reddit do I see almost the same post all the time or even repost, here I just see the same post more 😂 just go and look at r/steamdeck, same question over and over again, but I will read them all! haha

I don't know what kinds of subs you joined but big ones like meme is posting a lot. But I saw this on reddit too, even reddit thought my feed was a bit lacking so I had maybe 50% posts from subs I hadn't subscribed to, to scroll through 😂

But also remember we aren't as many here(yet). we just hit over 100k users yesterday.

https://lemmy.fediverse.observer/dailystats

And I think it is good to have multiple sources of entertainment. Even tho it is nice to have everything at one place :D

Sorry if this sounds like preaching and that I wrote a book. But here you have it haha

Edit: fixed a few grammar mistakes (that I saw right away)