I have found some strange behaviour of form ajax elements.
I have added #ajax to my form elements:
['#ajax'] = array( 'callback' => 'mymodule_ajax_callback', 'event' => 'change', 'progress' => array('type' => 'none'), );
and due to some other issues, i had to add ajax to my submit:
$form['actions']['submit']['#ajax'] = array( 'callback' => 'mymodule_node_form_submit', );
The issue is, when the form element ajax is triggered for "checkboxes" and "select" form field type at the same time, then submit callback is triggered but i never clicked submit.
Does anybody have any idea?