Please see the attached screenshot.
The menu being added is to long so all the right pane content is being pushed away. I think there are 2 solutions:
1. The menu just say "Git Build Data"
2. Give user an option to turn off this menu.
Refer to JENKINS-15048 for the earlier report of the same issue.
Screen shots of the issue are also available at http://www.flickr.com/photos/markewaite/7956418026/ and http://www.flickr.com/photos/markewaite/7956476354/ .
The issue is not yet fixed in the plugin code base, but I'm marking this bug report as resolved because there is an earlier bug report which describes the same bug.
I submitted a pull request https://github.com/jenkinsci/git-plugin/pull/95 to fix this.