为什么.htaccess在第二次斜杠后不添加文件？

I want to ask you why .htaccess file doesn`t add correctly files after second slash. This is my .htaccess file.

<IfModule mod_rewrite.c>

  RewriteEngine On
  RewriteCond %{REQUEST_URI} !(\.css|\.js)$ [NC]
  RewriteCond %{REQUEST_FILENAME}  -f [OR]
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteRule ^(.*)$ index.php [L,QSA]

</IfModule>

When the address is http://localhost:82/users it add files correct. But when the address is http://localhost:82/users/5. It searching files from http://localhost:82/user/....css. So I can`t have more than one slash in URL.