Google Analytics not displaying Drupal.org referral traffic

Hi,

We get quite some traffic from drupal.org to our website. Some time back we noticed that traffic from d.o or groups.d.o reduced to zero. Initially we thought there might be no traffic coming. But then we figured even on purposely clicking our link from d.o, Google Analytics does not show the referral as drupal.org, instead classifies it as 'organic'

This led us to conclude that we must be getting traffic but its not getting classified under referral from drupal.org. The traffic died from June 1 last year.

How is this possible? And what is the solution?

Any pointers will be really helpful.

Thanks

[Attached screenshot of our Analytics - shows no referral traffic from June 1, 2013]