QA Archive redirecting to sample-page

My site is redirecting me to sample-page when I try to go to the question archive. Also when I try to go to the QA user page I'm getting

"Not Acceptable!
An appropriate representation of the requested resource could not be found on this server. This error was generated by Mod_Security."

Furthermore the question is not displayed when I got to a question link.

My WordPress installation is in a separate folder.