.htaccess rewrite rules misbehaving - .htaccess

Question

ErrorDocument 404 /pageNotFound.php
RewriteEngine on
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-l
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^profile/([0-9a-zA-Z-_]+)/message/?$ message.php?user=$1 [NC,L]
#
#RewriteRule ^profile/([0-9a-zA-Z-_]+)/([0-9a-zA-Z-_]+)/?$ profile.php?user=$1&content=$2 [NC,L]
#
RewriteRule ^profile/([0-9a-zA-Z]+)/?$ profile.php?u=$1 [NC,L]
#
RewriteRule ^story/([0-9a-zA-Z-_]+)/?$ blog_post.php?url=$1 [NC,L]
#
RewriteRule ^forums/questions/([0-9a-zA-Z-_]+)/edit/?$ question_edit.php?url=$1 [NC,L]
#
RewriteRule ^forums/questions/([0-9a-zA-Z-_]+)/?$ question.php?url=$1 [NC,L]
#
RewriteRule ^forums/contribution/([0-9a-zA-Z-_]+)/edit/?$ contribution_edit.php?url=$1 [NC,L]
#
RewriteRule ^forums/contribution/([0-9a-zA-Z-_]+)/?$ contribution.php?url=$1 [NC,L]
#
RewriteRule ^forums/tags/([a-z-]+)/?$ allTags.php?tag=$1 [NC,L]
#
Above is my .htaccess file and I am using WAMP.
At first when I did this, everything works fine, but later on, some URLs started misbehaving for example if I type in localhost/profile/debbie after the page finishes loading the url changes to localhost/profile/Debbie/?u=debbie, though the page contents work fine. I just don't know why. But if I do something like localhost/profile/the_king the url remains the same after loading.
But later on the if I do this localhost/profile/the_king I started getting an error message of undefined index u
Secondly I have a Subdomain under WAMP for my mobile site which uses an IP address of 192.168.106.1 and I use a duplicate of the above .htaccess file for it, but if I do this 192.168.106.1/profile/the_king it just get back my pageNotFound.php error page back.
This is really getting me angry because I watched some video tutorials and I did exactly what they did but I just don't know why mine is misbehaving
Edit here is my configuration for my Subdomain
# Tells Apache to identify which site by name
NameVirtualHost *:80
# Tells Apache to serve the default WAMP Server page to "localhost"
<VirtualHost 127.0.0.1>
ServerName localhost
DocumentRoot "C:/wamp/www/"
</VirtualHost>
# Tells Apache to serve Client 1's pages to "client1.localhost"
# Duplicate and modify this block to add another client
<VirtualHost 127.0.0.1>
# The name to respond to
ServerName localhost
# Folder where the files live
DocumentRoot "C:/wamp/www/mobile/"
# A few helpful settings...
<Directory "C:/wamp/www/mobile/">
Allow from all
Order Allow,Deny
# Enables .htaccess files for this site
AllowOverride All
</Directory>
# Apache will look for these two files, in this order, if no file is specified in the URL
DirectoryIndex index.html index.php
</VirtualHost>
<VirtualHost 192.168.56.1>
# The name to respond to
ServerName localhost
# Folder where the files live
DocumentRoot "C:/wamp/www/"
# A few helpful settings...
<Directory "C:/wamp/www/">
Allow from all
Order Allow,Deny
# Enables .htaccess files for this site
AllowOverride All
</Directory>
# Apache will look for these two files, in this order, if no file is specified in the URL
DirectoryIndex index.html index.php
</VirtualHost>
<VirtualHost 192.168.106.1>
# The name to respond to
ServerName m.localhost
# Folder where the files live
DocumentRoot "C:/wamp/www/mobile/"
# A few helpful settings...
<Directory "C:/wamp/www/mobile/">
Allow from all
Order Allow,Deny
# Enables .htaccess files for this site
AllowOverride All
</Directory>
# Apache will look for these two files, in this order, if no file is specified in the URL
DirectoryIndex index.html index.php
</VirtualHost>