apache rewrite rules issue for specific pages

I have problem with my .htaccess redirections. When I type:

http://www.domain.com/contact

it goes to the index.php and not the contact.php

here's my .htaccess:

Redirect 301 /clients http://clients.domain.com



RewriteEngine On

SetEnvIf Host ^www\. page=www

SetEnvIf Host ^mob\. page=mobile



RewriteBase /

SetEnvIfNoCase User-Agent "^Wget" bad_bo

#etc ... 

Deny from env=bad_bot



RewriteCond %{HTTP_HOST} !^www.domain.com

RewriteRule (.*) http://www.domain.com/$1 [R=301]



RewriteRule ^about/?$ about.php 

RewriteRule ^contact/?$ contact.php 



rewriterule ^(.*)$ index.php?subdomain=%{ENV:page}&page=$1

in my php i get:

<?php



print_r($_GET);

Array (

  [subdomain] => www

  [page] => contact.php

)

What am I missing?

Source: Tips4all