Bought seeds off of ILGM.com and put them in rockwool on 4/24/21 they sprouted about 5-10 days later and once they formed roots I transplanted to Promix BX with 6.2PH water. Some of the seedlings have grown their sets of true leaves, but some are dropping and yellowing and havnt really grown much in since... What's the issue? I tried this same method on another 20 seeds and they are all doing fine... Is it the seeds or what?