First of all, because you’re making this bread totally from scratch, don’t expect your bread to be perfect in size, shape, and fluffiness as the store-bought items. So, you’ll end up with some that have puffed up entirely, others only half, and some not even a little bit. Nonetheless, all of them taste great. That said, the main reason this bread may not puff up much is usually if the baking temperature or skillet isn’t hot enough. Make sure that both are pre-heated before you even place the bread, and adjust the temperature if you feel it’s not hot enough.