It's the results, look at the URL. He entered DuckDuckGo into DuckDuckGo and got that. I've had a similar problem when my internet connections stops in the middle of loading DDG.
This indicates that you are not properly receiving the CSS file for the site. There is probably an extension that is blocking it somehow. What add-ons are you running?
AdBlock Plus has an unlimited number of possible filters you can add and many different filter subscriptions. Though the two main filter subscriptions (EsayList and Fanboy's List) don't cause any issue with DuckDuckGo, other ones might.
Was it a filter subscription, or a custom filter you made that caused the problem? If it's the first, you might want to contact the filter subscription's owner and ask them to fix the problem.
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