Hiya Cammy! :) congrats on doing a flush! too cool! :)
Bright green stool is fantastic! Green is the color of cholesterol, the stones are just the hardened version of that. So you definitely got stuff out that didn't need to be there!
As you can see from my post just above this one you can eat fat and still have a good flush. Sometimes people don't get good results because their liver is SO congested, it cannot create a lot of bile, and you need a certain amount of force to the expulsion of bile to force out those pesky stones. They are sticky and get clumped together.
To de-clump them and ensure a most effective flush, you need to do pre-flush work such as drinking a gallon of apple juice, or taking liquid phosfood for 3-7 days. Taht dissolves the stones, separates them, and makes it easier for the gallbladder and liver to expel them! :) So you might want to try those before your next flush and see what happens.
Hope that helps! :)