old posts going missing

old posts goin missing on reports forum,i have a lot of posts on my forum,but like this forum where at the bottom page it says p1,p2,p3 and so on,it hasnt got that,and old posts are going missing,but i can still locate the old posts by clicking on the memberlist and seeing olds posts from members,

any help would be great

Isn't this the same problem as this: https://help.forumotion.com/manage-the-appearance-of-your-forum-f45/missing-posts-t70092.htm

yes it is,i thought it was in the wrong category,any one know how to do this?

thanks