I started my first grow about 3 days ago and one of the days I left my light on two long and the steams got a little brownish and yellowish but leaves are still bright green, so is anything wrong.
both of mine were brown in color nothing wrong one was nice and green and changed to a brown color I was told it is normal.
Sounds like you might have stem rot there but I can't really say without a pic. Let the soil dry out more between waterings and put a small fan on them. Good luck!! Grins and smiles