I am totally confused, when I place site:example.com in google I see every page of my website in serp(search engine result page) except the home page. I don’t know why it’s happening but I check everything according to google SEO rule. But not getting success.I try to check my site through google webmaster tool everything is perfect there, Please help me to solve this.

htaccess rule of my site

RewriteEngine on

#RewriteBase /
#RewriteCond %{HTTP_REFERER} !^$
#RewriteCond %{HTTP_REFERER} !^http://(www\.)?example.ro/.*$ [NC]
#RewriteCond %{HTTP_REFERER} !^http://(www\.)?exa-example.ro/.*$ [NC]
#RewriteRule \.(gif|jpg|swf|flv|png)$ / [F]


RewriteCond %{HTTP_HOST} ^sitename\.com$
RewriteRule ^(.*)$ http://www.sitename.com/$1 [R=301,L]

RewriteRule ^privacy_policy.html$ privacy.php
RewriteRule ^contact_us.html$ contact.php 

#RewriteCond %{HTTP_HOST} !^sitename.com$
#RewriteRule ^(.*)$ http://sitename.com/$1 [L,QSA,R=301]

RewriteRule ^index\.php$ / [QSA,R=301]

RewriteRule ^([A-Za-z0-9_]+)_([0-9]+).html$ articol.php?id=$2
RewriteRule ^([a-z_]+).html$ categorii.php?abbr=$1
RewriteRule ^([A-Za-z0-9+]+)$ search.php?cuvinte=$1
RewriteRule ^images/$ images [F]
RewriteRule ^o_articole/$ o_articole [F]