Ask HN: Why does Google show different knowledge graph templates?

Consider the following search results: http://imgur.com/a/TYym7 (same thing flobots lyrics) and http://imgur.com/a/mAqjM (believer imagine dragons lyrics). Both search results have direct embedding of the lyrics, but have different templates. While the latter is from play store and has a link to visit the site, the former has no reference to the source at all. Any ideas on why the source reference is missing in the first link?