It’s okay. If you rule out water quality issues, it should be normal. It will disappear after a while. Because some glutinous rice is scattered or dissolved in the boiling water, or the leaves you use to make the rice dumplings are dissolved in the water, there will be some foam when you bake the rice dumplings, just like when you make soup, if there is no soup stock If you put it in boiling water, the soup noodles will have a layer of foam.