I'm confused about my points.

I have a Williams Chassis and a Ferrari engine, both my drivers(Button and Webber) failed to score points.

If I am right, I should get :
- 6 points for my Williams Chassis courtesy of Mr Rosberg,
- 2 points for my Ferrari Engine courtesy of Mr Bourdais.
Therefore total is 8 points.

But I am listed at 10.??

As Raikkonen finished behind Bourdais i get nothing for his Ferrari Engine, and likewise with Nakajima. Correct?