Hi Preetham,
Your configuration looks fine, but please check to see if the agent GRAC_SPM_CNTRL_AGENT is mapped to the stage below under "show details" in addition to being mapped within "Modify Task Settings". These do not always get populated, due to a bug.
Also, the Post Installation activities do not transport properly, and Post Installation steps need to be performed in each system independently. You should go through Post installation again in QA and Production, especially for Workflow Linkages... there maybe an inactivated linkage that is causing your issue.
Let me know if these do not solve the issue! My production configuration looks identical to yours and I have no issue. (GRC10.0 SP13)
-Ken