When they reach Girijanath Temple they remove old pole and the new pole is kept. And the old one is kept with the old ones. If we count those poles before keeping the pole they are 21 and after keeping the pole they are 21.
When they reach Girijanath Temple, they remove an old pole and keep the new one. The old pole is kept alongside other old poles. If we count the poles before keeping the pole, there are 21. After keeping the pole, there are still 21.