Hi there Bristol Blottie, it's not a major, but basically you're "chronically overwatering" , the soil keeps humidity in there, and since it never gets dry the wrong type of bacteria develop and attack your root system. litterally all you have to do is water less and maybe wait a bit longer before you water, in a pot that size it could be anywhere between three to five days, which is a lot more than people think. Try the pot lifting method to make sure you never overwater again. Hope this helps ! 🚀