If that is 14 days, I woud throw it out and make a new. I think the problem is water and maby soil. When that little, it needs like 1 dl every 2 days and when a little bigger 2 dl water, and so on.
Remember drainage, like perlite and clay pellets. If you have any questions, feel free to look in my diaries, and throw me a private message if needed. Best of luck mate🙂🤜🤛