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[eluser]vitoco[/eluser]
checking the ROUTER library ...

Code:

function _validate_request($segments)
    {
        // Does the requested controller exist in the root folder?
        if (file_exists(APPPATH.'controllers/'.$segments[0].EXT))
        {
            return $segments;
        }

        // Is the controller in a sub-folder?
        if (is_dir(APPPATH.'controllers/'.$segments[0]))
        {        
            // Set the directory and remove it from the segment array
            $this->set_directory($segments[0]);
            $segments = array_slice($segments, 1);
.....

only one subfolder it's getting checked.

If you want to use folders for your controllers...it may help to organize them as modules using HMVC..