Although the URL's for the IP address and domain both lead to the same content on any given date, the content for each was likely indexed on different dates. Note the differences in the snippet for the IP address, which starts with "5 days ago", versus the snippet for the domain.
It looks like much of the content there is dynamic and changes frequently, as other news-based sites tend to be. Hence they're not the same web pages as of the date they're indexed on, and both are valid URL's. Although the domain name resolves back to the IP address, Google can index IP addresses too.