On http://www.oschina.net/p/qutebrowser, the 器 char is rendered over the "qutebrowser" title for me - see the attached screenshot which shows QtWebKit and Chromium.

It seems like the three chars between 网 and 器 are unprintable, and QtWebKit doesn't print the boxes (which might be correct or not), but also doesn't take their width into account when calculating where to start the next word ("qutebrowser"). You can see the same behaviour with the slash at the right in the screenshot, or the list of software on the page.