Are they auto seeds? What did you cross to make them?
That soil does have nutrients, it is possible they were just too strong from some of the seedlings. Auto seedlings can be sensitive to early feeding.
Auto seeds . i cross it by myself maybe a wrong genetic . im pretty sure i cross with a bad one . this is th epic to show what the mutant are . 70 % of the seedling is perfect but around 30 % is mutant . i neve buy lo ryder # 2 its friend to friend seeds .
hooo i was thinking somethink ph level maybe ? normally i put ph at 5.8 ....