nofollow tags missing?

I would like to switch to Pretty Links as my main jump script plugin, but according to a test I just did, Pretty Links doesn’t appear to put nofollow tags even when I select that option. When I look at the source code of a page that has Pretty Links in itself, I don’t see nofollow tags around such links.

For instance, this is a test post

http://www.g510keyboard.net/2012-12/why-the-world-wont-end-in-2012/

that contains the following Pretty link:

http://www.g510keyboard.net/recommends/astronomy

However, when I look in the source code for that page I don’t see Pretty link is putting nofollow tags around its links.

Truth be told, Ninja Affiliate plugin (which I used so far) also has the same problem.

Could someone please help me to make this work (so that nofollow tags are inserted properly) because it’s important for SEO?

It seems my main blog was recently demoted in Google search results because of my shorter links that are not nofollowed (i.e. because I couldn’t make the plugin automatically put nofollow tags).

http://wordpress.org/extend/plugins/pretty-link/