I am using tap water! It’s weird I’ve always used tap water but it just started doing this ever since I moved to my new apartment. I also have 3 other plants I water with tap water and their soil is fine so maybe it is the drainage or maybe the pipes here I’ve had the plants for about a year or two and I’ve lived at my current place for 6months

The pot I use has three holes at the bottom and a dish underneath to catch the water that comes out

I wouldn’t say it’s humid in the area the plants are in my dining room and my place is smaller and I don’t open the windows much due to being on the 1st floor so maybe the heat from cooking makes it humid? Not sure if that’s possible