That depends. How many sets are up? At some point the first ones will kick off, but if you are getting plenty of light to them, then yes you have problems. Always start your plants off slowly with fert's and gradually build up. Sort of like weight lifting. You don't do your first press at 250lbs. unless you like walking around with your balls tucked in your socks.
You could be over watering as well. the tiniest leaves will show the first signs either way. Good luck
out.