YELLOWING AND GRAYING BABY LEAVES ON BOTTOM OF PLANT

Hello my fellow growers; I have a problem from time to time with random genetics I have in flower stage. I don't know if it's due to lack of nutrition or bacteria, but I am getting baby leaves at the bottom graying and yellowing and dying. I have photos but I don't know where to begin on what I am doing wrong. [other than ph of course]. I am also looking for a PH solution to this, if there is one. And if this is a clear error, feel free to throw the internet slap on me. All good. Thanks!

Give us more details on your grow. The more info you include the better the info you will receive.

You'll want to include feeding/watering scheduel. Type of grow medium. Rh factor. Temperature. PH.

They look over watered.

I second over watering .

Schedule is almost every day. If not every other day. Medium is Builders nutrient-less soil with Dr.Earth Veg and 4-4-4 for first feed. However, this started happening after a top feed of Dr. Earth Veg and Bloom. PH is 6.7-however- Of course the Blue Lab pens require the KCI storage solution when not in use...which I have not done. My uncle says it could be because of that...but that's kinda odd to me. I understand I am suppose to use KCI solution, but the PH still reads true whenever I try calibrating in 7.0 and 4.0 solutions. Im going to try to pick some up today and see if that helps..but man. And the graying is getting worse.