Drupal show breadcrumbs on certain nodes
When using the path breadcrumbs module it doesn't append the title to the end unless you add it yourself when configuring the breadcrumbs.

It is quite possible that what is adding the title is your theme.

For example the zen theme has an option to show the page title at the end of the breadcrumbs, as do lots of other themes.

To get to these settings, on your site go to admin/appearance and then click the settings link for whichever is your theme.