Mandatory information about my setup:

Have I searched the tickets before posting? yes
Have I searched the forum before posting? yes
Have I read the documentation before posting (which pages?)? yes
Joomla! version: 2.5.20
PHP version: 5.3.2
MySQL version: 5.1.73
Matukio version: 4.0.0
Direct link to the page that shows the issue: Not accesable from outside


Description of my issue:
Logged in on the front-end, in the event site, there are three options "Events", "My Bookings" and "My Offers"
The two first options are alright, byt My Offers leavs me with an odd looking site(tried to attache picture, error)
Below the source code for the site (matukio is translated to swedish)

<!-- Matukio by compojoom.com -->
<div id="matukio_holder">
<form action="/JUpgrade/http://index.php/sv/kursutbud/aktuella-kurserkursanmaelan" method="post" name="FrontForm" id="FrontForm"><table cellpadding="5" cellspacing="0" border="0" width="100%"><tr>
<td class="sem_tab0">
<a class="sem_tab" href="/JUpgrade/http://index.php/sv/kursutbud/aktuella-kurserkursanmaelan" title="Kurser" onmouseover="window.status='Kurser';return true;" onmouseout="window.status='';return true;">
<img src="http://www.atumo.se:8000/JUpgrade/media/com_matukio/images/2600.png" border="0" align="absmiddle"> Kurser</a></td>
<td class="sem_tab0">
<a class="sem_tab" title="Mina bokningar" href="/JUpgrade/http://index.php/sv/kursutbud/aktuella-kurserkursanmaelan/1" onmouseover="window.status='Mina bokningar';return true;" onmouseout="window.status='';return true;"><img src="http://www.atumo.se:8000/JUpgrade/media/com_matukio/images/2700.png" border="0" align="absmiddle"> Mina bokningar</a>
</td>
<td class="sem_tab1">
<a class="sem_tab" title="Administrera kurser" href="/JUpgrade/http://index.php/sv/kursutbud/aktuella-kurserkursanmaelan/2" onmouseover="window.status='Administrera kurser';return true;" onmouseout="window.status='';return true;"><img src="http://www.atumo.se:8000/JUpgrade/media/com_matukio/images/2800.png" border="0" align="absmiddle"> Administrera kurser</a>
</td><td class="sem_notab"> <a href="/JUpgrade/http://index.php/sv/kursutbud/aktuella-kurserkursanmaelan/createevent" title="Ny kurs"><img src="http://www.atumo.se:8000/JUpgrade/media/com_matukio/images/1832.png" alt="" border="0" align="absmiddle" /></a></td></tr>
</table>
<table cellpadding="4" cellspacing="0" border="0" width="100%"><tr><td class="sem_anzeige"><table cellpadding="2" cellspacing="0" border="0" width="100%">
<tr><td class="sem_cat_title">Administrera kurser</td></tr>
<tr><td class="sem_cat_desc">Här ser du alla dina kurser.<br />För att ändra en kurs, klicka på symbolen i front-end för kursen. Du kan även skapa nya kurser överst på sidan.</td></tr>
</table>