Go to the front page of the forum, where all the thread titles are. Look at the column labelled replies. As i type is is currently showing 1963 replies, with the last by walter mitty.
divide 1963 by the number of posts per page (40 in my case) This gives 49 with a bit over, so the system thinks it will need 50 pages to display. To check this, hover your mouse over the last page link, it shows
http://www.pprune.org/forums/showthr...284415&page=50 Click on that link, and you actually go to page 48
Pages 49 and 50 are shown in the upper right display area as available page numbers, but clicking on them only takes you back to page 48.
Go to the end and find Walter Mitty's post - it is post number 1896, so there is a discrepancy of 67 posts
Does this make it clearer SD? Does your system also show the same figures?