Benzelsanswered grow question a year ago If you over water them then yes, that does tend to happen, leave em a day or two days longer before you water them in the future, once a week should be enough at this stage as they have small root systems, and its not that warm out yet either. Let the soil dry out more before you water next. Its that or your PH is WAY off in the soil or your water.
Id think its the over watering before the PH thou. The roots are likely not getting enough air to grow faster. So ease up on the watering til they are bigger ok?