Hey there again Gteh420. Just a few things, first off: get rid of that lava, you dont want to keep that moisture in there the same way growing inside than outside. Keeping moisture in will lead to "moisture mold" and this is what is causing and will cause problems for you. You're overwatering, this is easy to do if you dont have a good system to measure your watering needs and schedule. here s a fool proof technique that will help you figure out when you need to water :
www.youtube.com/watch try this to keep a strict wet dry schedule , hope this helps ! 🚀