Hulda Clark says to stop all supplements including vit C the day of the flush and you say that you had some at mid day. Perhaps this may have slowed things down.
Personally I do not have good results if I have high Sugar foods the day of the flush as I think this activates my candida and somehow slows things down. Maybe the high Sugar juices you had for lunch could have triggered something similar. What did you do on previous flushes?
Maybe your body was just not ready to flush again or maybe and hopefully you are nearing the end of your stones.
Good luck and well done. 65 small stones is 65 stones of an improvement.