Tabs Teaser view is not teasing

I have tabs set up, and as a view, I have selected Tabs - Teaser List.

However the content doesn't tease. The full node content is displayed. The regular teaser view teases correctly, and so I am uncertain what the issue is. I have made a few minor edits to tabs.module:

function theme_tabset($element) {
$output .= '';
$output .= $element['#children'];
$output .= '

';
foreach (element_children($element) as $key) {
if ($element[$key]['#type'] && $element[$key]['#type'] == 'tabpage') {
$output .= '
• '. $element[$key]['#title'] .'

';
}
}
$output .= '

';
$output .= '';
return $output;
}

The ul class is changed and children is moved in front of the ul.

I have also made a couple of css changes, but I don't think those should affect the teasing. I have also tried to manually break the node, but still no teaser is displayed.

Please help.