Thread:Project:Support desk/Table of contents full width

we recently upgraded our WIKI software and are now on

MediaWiki 1.22.8 PHP 5.3.17 (apache2handler) MySQL  5.5.37

With the previous version, the Table of Contents, at the top of each page was on the left hand side of the screen and its width fitted the widest text.

After the upgrade the Table of Contents is now full screen width.

What have we missed during the upgrade and how do we fix it now?