Sublink in administration redirected to main admin page

Links belonging to images presenting administration groups (e.g. in XWiki Administration > Users & Groups) don't lead to their pages, but a user is redirected to a main Administration page.

See attached image: If I click on Groups image, I will go not to Administration: Groups, but to the main Administration page.

Links in the left column works fine.

The difference is "&" vs. "&":
Working URL: http://myweb/xwiki/bin/admin/XWiki/XWikiPreferences?editor=globaladmin&section=Groups
Not working URL: http://myweb/xwiki/bin/admin/XWiki/XWikiPreferences?editor=globaladmin&section=Groups