Running 83.0, latest version. Disabled all my addon's, restarted the browser, and the issues still continue. It is only in the sub categories (example Suggestions, Balance Discussion) the scroll issue appears. There is no scroll issue in the main categories (example General Discussion, I need help).
With the pagination setting, setting the number of topics or post per page does not save any other value than 20. I can make other changes in my account settings and they save just fine and are applied as soon as I navigate to another page.