Because sorbitol, lactose and fructose are Sugar your body can have two reactions:
a. It ferments the food
b. The malabsorption will cause an "osmotic purge". This means it attracts fluids back into the colon, making bowel motions loose and watery. It sounds like IBS (I dont't have IBS by the way)
When you are intolerant to any kind of food it will ferment and as a consequence you will have not only allergy but candida. Undigested food becomes soil for bacteria, which ferment and decompose it, and stinks.