Duplicate titles on some pages

While this is not a skin issue per see, I'm putting it for now till we find a solution and tom remember that we cannot release XE 2.0 with colibri skin as default with this issue not solved:

The following pages have 2 titles:

• http://localhost:8080/xwiki/bin/view/Main/WebSearch?text=test&x=0&y=0
• http://localhost:8080/xwiki/bin/view/Stats/
• http://localhost:8080/xwiki/bin/view/Stats/Activity
• http://localhost:8080/xwiki/bin/view/XWiki/WatchListManager
• http://localhost:8080/xwiki/bin/view/XWiki/Admin (user profile page)
• http://localhost:8080/xwiki/bin/view/Scheduler/
• http://localhost:8080/xwiki/bin/view/Panels/
• http://localhost:8080/xwiki/bin/view/Main/Tags
• http://localhost:8080/xwiki/bin/view/Blog/