This is just my opinion ok? and feel free to change my mind because we are here to boost our knowlege.
You flushed your plants 1 week ago, I will bet that you did it because you over feed them.
First you get symthomps of overfeeding, you flush so the ppm are so low in soil that the plant only have to "eat" what she have in her leaves, so you run in a deficiency state and she will show you the flush you did a week ago.
Keep feeding them and control the EC, for this phase it should be near to 1.6-1.8, feed them 2 times a week and they should be fine.