Hey Sasank,
The issue you are experiencing is due to your use of the new customer accounts—web pixels do not yet track on these pages, but that functionality is currently in development.
To switch from new customer accounts to classic customer accounts, head into your shop settings panel, and then select customer accounts from the lefthand sidebar. From there you should see settings at the top of the page for toggling between the account types. Keep in mind that you will need liquid templated out for the classic account pages including registration and login.