It's caused by leavening agent. Add some malt syrup, multi-source foam, etc. The recipe of soft handmade coarse cereal pancake is: 71 kg of flour, 31 kg of coarse cereal powder (or not), 1-2 kg of multi-source foam, 8-12 kg of malt syrup, 1.3-1.5 kg of salt and 71 kg of warm water. Operation technology: take 51 kg of flour and add 51 kg of boiling water to make a paste, cool down to 41℃, add 111 g of yeast and ferment for 1-3 hours, and get the paste. Dry-mix the remaining flour, miscellaneous grains powder and multi-source foam evenly, add the batter, then add malt syrup, salt water and the rest warm water to make the batter, and let it stand for 21-31 minutes. Heat the hoe, rub some oil, pour the batter, scrape it with bamboo dragonfly, and cook it with slow fire.