It is a known fact that Google iterates its search results from time to time to try new things. A few months before changing to the new search layout (currently applied), Google changed its layout and design.
Original Sitelinks as seen for cnet:
New SItelinks as seen for sinapse blog:
The new search layout provides ‘Sitelinks’ with are now underlined, show the link and a very small snippet. The new sitelinks format is descriptive and helps to understand the content of each sitelink. However, it makes the sitelinks occupy a lot of screen space.
Further, sitelinks generally show up only when the search is directly matching with a site. In case of specific searches like that of ‘sinapse blog’ would be helpful.
Update – A day later the new trial format seems to have been changed back to original one: see below image