Seedling issues

Can I get any tips for what's going on with these two plants so I can prevent it in the others
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Update
Sorry it's been a little since I updated this thread.
Current plant progress
All three main plants pictured were topped
The biggest one was topped yesterday and the one with 4 new shoots was topped 5 days ago and the Weekes looking one 5 days also but not doing as well
Have added cal-mag into there watering
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