Two Points:
Interesting thing just happened to me on the Ground Improvements thread. I went to the last comment on page 43 (the last page) to read the latest comments and the last post was May 20th at 1101 pm. I then went to the previous page to look at previous posts and upon returning to the last page (43) the last post was now May 19th at 9.49 pm. I tried several times to get this to work properly but nothing changed.
Happens to me very regular, I've just accepted it now
I try to work out the missing posts with guesswork or hope I see the quote someone is replying too