Distorted style of forum website

Hi,

a forum website has distorted style sheet if loading via polipo.
After setting Firefox to load directly without polipo the forum is working 
as usual.

To get an impression I have a message here inside that forum including a 
screenshot:
http://www.elektrikforen.de/allgemeines/17607-techn-probleme-im-forum-7.html#post141803

I also tried with an empty polipo configuration and the latest GIT rev.

Best regards,
Massimo


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