These "stones" are very often (at least 70-90% of time) just bile that precipitated into cholesterol (hard bile) and it most likely happened during the liver flush.
As your intestines were very clean, cleaned by Epsom Salt taken before the oil, the only thing you have mixing with bile are oil and digestive juices. I do not know how it happen, but I assume that digestive juices from the stomach cause bile to turn into cholesterol.
That is the reason why some people keep expelling those stones even if they are doing Liver Flushes every single day, day after day.
ANd, another problem is, some of those cholesterol formations are simply too large to pass through common bile duct and through sphincter of oddi without getting stuck there.
So, just forget the story about the "stones", both Hulda and Andreas have it wrong there, they simply misunderstood what is going on.
Yes, real gallstones, if small enough, can also exit, and can also get embedded into those green "overnight created stones" but at least 70-99% of times those green "overnight created stones" are just formed overnight.
So, keep flushing if your think it is good for you, take a break from time to time, but do not fall for misunderstanding, as some people never "stop producing the stones" so if you goal is to reach the point where you have a Liver Flush with no stones, you may have to flush for a very long time.
Anyway, there are many alternatives to liver flushing, like drinking some oil every day, coffee enema, liver herbs, castor oil compresses, liver massage, gallbladder massage, foot massage, etc.