Not sure if this is a known problem, but for me it sometimes happens (especially when coming back to a browser tab after a few hours) that the comment threads and the main post are from two entirely different posts. Since it probably matters, I’m using beehaw via the Brave browser.
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I’ve had this happen in Jerboa a few times (the android lemmy client). I’m pretty sure it’s happened to me with comment threads on both beehaw and other instances, but definitely at least on beehaw.