The lumps in Velveeta soy milk powder may be caused by moisture or improper storage. If the lumps are only minor, you can try to break them up by gently stirring with a spoon or fork. If the lumps are more serious or the soy milk powder has gone bad, it is recommended that you do not continue to consume it, as soy milk powder that has gone bad may cause digestive problems or other health issues. If the soymilk powder is spoiled or damp, it is recommended to stop consuming it immediately and discard it. To ensure the quality and safety of soymilk powder, care should be taken in its storage and use. It is recommended that soy milk powder be kept in a dry, light and ventilated place, avoiding humidity and high temperature environments, while it should be consumed as soon as possible after opening.