Name board is Mumbai-Howrah-Puri since it shares its rake with Jagannath Exp which runs between Howrah-Puri. There shouldn't be any confusion regarding this since train board clears the confusion. However,you can cancel your ticket and file TDR to claim refund if you cancel your ticket within 3 hours of actual departure of train. You will get 50% of the orignal amount back as refund.