because there were vacant berths till SBC (intermediate station), and after that RAC was allocated on GN quota of TPTY-CMNR Stretch. i.e RAC 26 and below are passengers travelling beyond SBC,hence this pnr got RAC 27 and onward.
from TPTY-CMNR, this train is fully in GN quota and no PQ or RL quota for intermediate stations.