- Shishka
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- Exalted Mythic Member
First, the word is "thread," not forum. You post to a forum, you don't post a forum.
Second, threads don't just disappear. Threads that are freshly created, or replied to, are moved to the top of the list, and older threads are pushed down to the bottom of the page. Since only 25 threads are allowed per page, older threads end up being pushed onto the next page, and so on.
At the bottom of the forum are some numbers and arrows. These are page selection tools for looking through past posts that aren't on the first page. I don't believe your posts have been deleted for any reason, so you should look there.