I have posted a question and answered it to test it. When I delete my answer or question I can still see they exist. I also deleted them as admin from backend still nothing. I cleared cache and the questions and answer still exist. 

Also I have .htaccess as follows but not sure if this is causing the problem

<FilesMatch ".(ico|pdf|flv|jpg|jpeg|png|gif|js|css|swf)$">

Header set Cache-Control "max-age=2592000, public"

</FilesMatch>