This is what happend to my two feminized normal seeds, only one survived, you definetly got a bit of overwatering and some defficiencies there, potasium or phosphate, anyhow easy DIY home made fix for these, for the overwatering i recommend changing to a bigger pot, better soil please and no water so it absorbs that thing, hope most surviev, then you need to dry banana hard at sun / oven with care and some eggshells cleaned of that foil and leaving the shell clean, i recommend leaving them in water for a while first then easy to remove, you powderize these two, bits at a time then mix it togheter and mix it with upper part of earth, then on your next water you'll see improvements, some root stimulant might help or damage depending how bad it is. I'm dealing with a bit of yellowish on the autos and no idea why.
Don't yet kill the leaves till new ones sprout and are green.
https://www.rollitup.org/t/from-over-watering-to-some-deficiency.1017150 here's mine's evolution.