Pictures would certainly be helpful, but it sounds like either over or under watering.
What grow medium are you using?
If soil...what size pots?
What mixture and brand is your soil?
What kind of lighting are you using?
How is your ventilation?
What temps are your grow room?
How often are you watering?
How old is the plant?
How high is the light?
Have you fed nutrients?
What kind?
How much?
How often?
Might get a lot more help if you can provide that information and a picture. Should be able to get your mind at ease or your problems resolved, but with what you wrote you won't get much in the way of responses.