outbound-article- tracking?

In our Google Analytics we see “outbound-article” which shows links to outbound URLs. We also see “outbound-article-” with the extra dash on the end that shows internal links in the website. What is the “outbound-article-” tracking? Or is it a bug? Using version 5.0.5. It just started on September 13, 2014, for us (maybe when we updated the plugin?).

Thanks.

https://www.ads-software.com/plugins/google-analytics-for-wordpress/