Jelly fails to set: Jelly may not set properly if there is an imbalance of the ingredients.
Cloudy or foggy jelly: The resulting jelly can sometimes be cloudy or foggy due to improper processing or unsuitable raw materials.
Formation of crystals in jelly: Crystals can form in jelly due to high sugar content or if there is improper dissolution of sugar.
Syneresis or weeping of jelly: Syneresis refers to the weeping of liquid, or separation of liquid from jelly which results in poor texture of the final product.