This is one of the most dificult questions to answer.
Why no stones?

Unfortunatelly, you gave an answer to those sceptics who believe that stones are always formed from olive oil, and who were asking for anyone who actually didn't get any stones out when doing liver flush.

Possible reasons:
1. Liver parasites
2. Congested liver
3. Something else like ... bad day, wrong day ...

In any case taking liver herbs is recommended.
In any case, taking parasite killing herbs is recommended.
And, in any case repeating flush onemore time in 2 weeks is recommended.

So far, only few people experience "no-stones" on the first 3 flushes ... and most often it is caused by the combunation of all 3 reasons (Liver parasites, Congested liver (poor liver health), bad day )

I hope this helps

Improve you diet as much as you can. Increase your physical activity as much as you can. That helps liver function ...
And, eliminate Sugar (concentrated sweeteners) from your diet.

Agnes