The main cause of deviled eggs losing their flavor is due to bacteria, but also because they have been made too early. u003cbr/u003eu003cbr/u003eThis is when you make the deviled eggs but do not need them for a day or several hours.u003cbr/u003eu003cbr/u003eDeviled eggs are always best made closer to when you need them. This ensures both the flavors and textures are perfect for eating, and that no bacteria are present.