whenever i create a new topic the post itself gets reduced for example:i post a 1000 char long post
and what appears only is a few parts of it
i checked the maximum post length settings and everything , can't find the source of the problem
First, upgrade to 2.0, then convert to UTF-8.
https://wiki.simplemachines.org/smf/Why_do_I_have_partially_blank_or_missing_text_in_posts
While that's true, there are additional circumstances not covered in that wiki article that 2.0 series does address but that for various reasons, 1.1 cannot.
maybe we need to edit that article to include the first step is to upgrade to SMF 2.0 then apply the steps it suggests if the user is not already on SMF 2.0.