Codeigniter-HMVC框架不接受同一级别上控制器名称相同的控制器下的目录名称

Codeigniter-HMVC framework is not accepting directory name under controllers with same name as of controller's name on same level.

modules
    ->my_module
        ->contollers  
            -> level1_controller.php
            -> level1_controller
                   -> level2_controller.php

URL: [my Domain]/my_module/level1_controller/level2_controller returns 404 error, as it is looking for method name level2_controller in level1_controller.php

Is this just a limitation of HMVC or i'm doing it in wrong way? Is there any way that I can make HMVC to understand directory name same as of controller's name on same level?