I made an clean test install. double numbers are gone.
I get on this page: http://ubuntufrage.de/admin/plugins
this error:Notice: Undefined index: min_q2a in qa/qa-include/qa-page-admin-plugins.php on line 114
this Error produce the addon bbcode editor also arrow up vote is disappeared ater enabled bbcode editor.
Removing bbcode editor and all errors are gone.
bbcode editor uses jquery 1.4.3.min.js and plugin jquery.markitup.js
Sad, :( in my opinion is bbcode editor much better than fck editor...
bbcode editor is not compatible with q2a in version 1.3.3