Tracking of Sites in Piwik

We created a Piwik Test site and added a couple of ISS pages to it that had links to other ISS websites that we had previously set up for tracking. If we access the test pages and click on links that go to other ISS sites being tracked in Piwik it’s not tracking these hits, but it is tracking visits to external URLs and to the test page URL itself. Can you pls help us troubleshoot this?