Jetpack uses wrong URL for Twitter

Hello .. I start right away.

I got the following problem with WordPress, Jetpack and Twitter.
Everytime I post something on goodtunes.de, Jetpack posts automatically the link to Twitter (perfect!) BUT it uses the wrong URL.
Instead of using someting like this:

Right link: http://www.goodtunes.de/2013/06/black-alley-soul-swagger-rock-sneakers-tape/ Jetpack uses this url:

Wrong link: web342.rb-media-s7.de/?p=6156

This is the URL where my WordPress is installed. So how can I change that because it doesn’t really help to spread the work with such a “wrong link” ?

Thanks!

http://ww.wp.xz.cn/extend/plugins/jetpack/