I did fractional CO2 laser on 22 Aug 14. May I know if the scar on my face is normal? These photos were taken on 9/2/14. (photo)

The areas that you are concerned about are secondary to overlap of treatment areas.  You are still quite early in your recovery peroid, and with diligent treatment this should resolve.  Typically, this condition can improve with skin lightening agents and steroid creams.  I suggest you followup with your physician for further evaluation.

The cause of a grid pattern after CO2 laser is overlap between one area and the next.  The lines are places that essentially received twice the laser energy as the skin next to it.  You need to be on topical treatment to minimize the appearance of the grid (sunscreen, steroid and skin lightener)  If you are fortunate, this will disappear with time.