problem of automaially redirecting

hello guys, my website is automatically redirecting to another page
without any code .

ie,

if am standing on this page
http://localhost/dubairealestate/enquiry/

after some time of inactivity it redirects to
http://localhost/dubairealestate/enquiry/index.php

why is this so??? is this any pblm with cakephp??? pls help

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