I downloaded your zip file and took a look at your screen shot (nothing amiss there as far as I can see) and your spidering log. Just before the link that was being spidered multiple times is this link:
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http://444.docs4you.at/Content.Node/Veranstaltungen/index.php?S=navi
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When I tried to bring up that page in my browser, it seemed to fail. I don't speak German so I don't have a clue what the whole page says, put there is definitely an error in the first line:
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Warning: Cannot modify header information - headers already sent by (output started at /Node/node/portal.node/uups.php:2) in /Node/node/portal.node/uups.php on line 9
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Maybe fixing that will get your problem cleared up.