It's because the public Freebase data that this visualization is based on is far from complete. For these programming languages and other things, it is as if most of the Wikipedia articles existed on the subject, but they contained nothing but the summary information. Have to start somewhere though, Freebase is a great start for structured information associations.

You can view the CFML entry here: http://www.freebase.com/m/03tsq7 and see that the 'Influenced by' and 'Influenced' associations are empty.