<p>kjetil b halvorsen is not bumping up old posts. They are improving questions, which in turn bump the questions because that is how Stack Exchange works. kjetil b halvorsen has edited 3,291 posts whereas you have edited 24 posts so far  on CV, so you may not noticed it.</p>

<p>Stack Exchange users have repeatedly asked on main meta to have an option to edit the question without having it bumped to the front page, but to no avail. Feel free to try your luck there if you agree that this is a missing feature.</p>
