Incorrect link for OpenOffice Server in /xwiki/bin/admin/XWiki/XWikiPreferences page

OpenOffice Server link is garbled when Apache proxy module corrects link in xwiki/bin/admin/XWiki/XWikiPreferences page
When shown through application server port it seems correct in browser:
..
<li class="XWiki"><a href="/xwiki/bin/admin/XWiki/XWikiPreferences?editor=globaladmin&section=XWiki.OfficeImporterAdmin" style="background:url(/xwiki/bin/download/XWiki/OfficeImporterAdmin/icon.png) no-repeat;"><span>OpenOffice Server</span></a></li>
..

but when it is passet through Apache proxy module, it changes link to:
..
<li class="XWiki"><a href="http://test.odo.lv/xwiki/bin/admin/XWiki/XWikiPreferences?editor=globaladmin&section=XWiki.OfficeImporterAdmin" style="background:url(<span class=" nobr></a><a href="http://test.odo.lv/xwiki/bin/download/XWiki/OfficeImporterAdmin/icon.png">http://test.odo.lv/xwiki/bin/download/XWiki/OfficeImporterAdmin/icon.png</a>) no-repeat;"><span>OpenOffice Server</span></li>
..
and link in browser is garbled.

Other correct link for comparison:
original:
..
<li class="Photos"><a href="/xwiki/bin/admin/Photos/Links?editor=globaladmin&section=Photos.Links" ><span>Photo album</span></a></li>
..
and through the Apache proxy:
..
<li class="Photos"><a href="http://test.odo.lv/xwiki/bin/admin/Photos/Links?editor=globaladmin&section=Photos.Links"><span>Photo album</span></a></li>
..