forum page number problem

We have a cituration post number problem.
Forum topic page numbers "15" and a new post have a ride, last topic has cant see.
for example;
/main forum/c=10/F=26&PN=15 page per page number of topic numbers 34.
page 15 last post number TID=7027

if user add a new post, TID=7027 cant be see it. if admin/user delete the 15 pages of one post 7027 can see.

Page numbers 15 cant be exceed.

Topics Per Page: 34
Posts Per Page: 30
Hot Topic Number of Views: 200
Hot Topic Number or Replies: 50
Number of Poll Choices: 25

what can i do?