Northern Lights/Critical - Autoflower

If the soil is always moist, then you've answered the question.... it IS overwatered! Overwatering isn't a matter of giving it too much water at one time, it's a matter of the soil being constantly wet... so let the pot dry out completely before giving it anything more. If this were not an autoflower, I would suggest you investigate the roots but this SHOULD NOT BE DONE for an autoflower.... they are VERY finicky about stress and that would stress them out. Let the plant dry out completely and then get into the practice of lifting the pot to see how heavy/light it is before you give it anything more, be it water or a nute solution... you'll be able to tell, you really will. Good luck!