Phonix sir, i have mentioned in many post that this train is running with extra 3A and SL every alternate 2 trips. When 3A is added, passengers are upgraded to clear CKWL. When SL is added, preference is given for GNWL as per rules. If you do little calculation after HO release in evening, you will get clear idea. Here is another pnr to predict for you -
/pnr/post/1036448