Settings form - $format_settings inside loop

Hi, I was implementing the hook_node_export_format_handlers hook, my settings_callback gets called but the elements i return for the form do not get visualized. I checked on the node_export_settings method in node_export.pages.inc and I realized that the $format_settings = array(); is inside the foreach loop resetting its value to an empty array.
Pulling it outside of the loop everything works ok
thanks