php - Unexpected behavior in mod_rewrite

I tested these mod_rewrite's

Options +FollowSymlinks

RewriteEngine On
RewriteBase /

RewriteCond %{REQUEST_URI} !-f
RewriteCond %{REQUEST_URI} !-d
RewriteRule ^(.*)\/$ /index.php?req=$1

rules at http://htaccess.madewithlove.be/

and got exactly the results I needed, as you may see in this image:

but when I run the very same URL in my server I receive a 404 error:

Any clues about why is this happening?