no i just flushed them a week ago had the same problem. But my plants are locked out for sure. Since i flushed them last week i have been givin them a 50% base diet and 2.5ml of calmag plus to my r/o.
I would flush until the water comes out the same ph as I was putting in. Also, get 1 part noots, much easier for beginners.
I like the Advanced nutrients. I started out just using that stuff. Then later you can get creative with the Calcium and shooting powder or whatever you like.
I do not think that it will hurt them to flush more, as long a sit is all during the same period. How fresh is the dirt? Is it a high ph mix? This will be my last post here as you may need someone with more experience than me. And I don't want to steer you wrong. Good luck