Genetics.?!

@SanderanderS firstly how do you know the roots are not compromised? without seeing them you can't really know what is happening under the surface Your plant has overfeeding issues mainly a nitrogen toxicity probably caused from a PH related lockout It also looks like you are overwatering and doing too often Your plant NEEDS air and so do the roots if the soil is always wet they cannot breathe properly Allow drying a little between feeding/watering

I see signs of nitrogen toxicity and maybe some overwatering. I could be wrong but they are sitting in pools of water and that's not the best. The claw like fan leaves in combination with darker overall green saturation of the leaf is nitrogen. It can also make the leaves more brittle and simple bending causes them to crack. Its weird the other one is not showing the claw as well. but it is a different plant and they all feed differently to some extent. I'd lower on the feed. what mixture of ghe tripart are you useing? it has micro, grow and bloom. Good Luck!

I would guess nutrient lock up she just might not accept as much as her siblings https://growace.com/blogs/learning-center/how-to-fix-nutrient-lockout