

Is this normal?
Update:
So I did the runoff testing and here are the results that I am not sure how to approach.
I feed the plant 1 with PH 6.4 and 1050ppm EC Runoff test came as PH 6.3 and 1400ppm EC
I feed the plant 2 with PH 6.2 and 900ppm EC Runoff results: PH 6.3 and 1250ppm EC
Do I need to flush the soil or anything?
I have recently switched to 12/12 and new growth is coming out in yellow green... What am I doing wrong? Nothing else changed apart from lighting period.