Form does not save value to variable I'm loosing my head. This is the function for generating my admin form:

function section_description_and_images_settings() {
  $form = array();

  $form['images_style'] = array(
    '#type' =&gt; 'radios',
    '#title' =&gt; t('Set default images style'),
    '#options' =&gt; array(
      0 =&gt; t('Bootstrap columns'),
      1 =&gt; t('Slideshow'),
    ),
  '#default_value' =&gt; variable_get('section_description_and_images_images_style', 0),
);

  dsm(variable_get('section_description_and_images_images_style', 0));
  return system_settings_form($form);
}


And variable section_description_and_images_images_style does not store the desirable value. It's always 0, whether I set 0 or 1.

Any ideas what might be wrong?
Variable name is "images_style" in your case