tarev said:I cannot see the entire plant, but the leaves seems to be the older ones. It is normal for the older ones to die out first eventually.
Cuttings grown in water, have water roots, so when moved to soil, it may die off till the plant is able again to grow roots for soil use. Just be patient, and do not be tempted to overwater.
Run ceiling fans or open up windows, weather permitting, to allow cross ventilation to lessen fungal issues around your plant.
No fertlizers, just be patient for now. Water only as needed. Do not make them too bone dry.