How can I get the current widgets name of a node?
From the docs of field_info_widget_types() :

Returns information about field widgets from hook_field_widget_info().
Parameters:
$widget_type: (optional) A widget type name. If omitted, all widget types will be returned.

You might be leaving the parameter empty. Hence, it is returning all field widgets. Pass the name of the widget from the current node, to get the right information. You can use menu_get_object() to get the node object of the current page, and find the appropriate widget to pass to field_info_widget_types().