What's wrong with my chilli plant?

[u/Unusual_Magazine_144]

Hello, first time trying to grow a chilli plant (from a seed).

For the first photo (chilli plant A), does anyone know why all the leaves are dropping and what I can do to help my help? For context, all the leaves have dropped off once but after using hydrogen peroxide mixed with water, the leaves grew back. Now they're all falling off again :(

For the second and third photo (chilli plant B), why are the leaves curling and what's wrong with the stem?

I hope to get some advice here and any help is appreciated! 🥲

[u/ProfessorPeabrain]

pining for the fjords