I don't think this is an issue with DuckDuckGo... Maybe check the following:

1) Make sure your computer doesn't have any adware on it. If you aren't running a virus scanner you can download adaware or another free adware remover.
2) Make sure the result isn't an advertisement. If it's the very first result then it could just be an ad..
3) Make sure you aren't connecting to a proxy or VPN. Doubt that would be the issue but it is something you can check on your browser.
4) Maybe try clearing your browser cookies and cache.