It's so little it's not possible to really say if it's something or not.
But are those the first set of leaves? As CannaCountry said, keep checking the newer ones for signs, because it's looks healthy to me
I don't know about this sorry. But in order for someone to help you you should add a lot more info about substrate, components of the solution, pH values, basically everything about it. Else it's impossible to tell.
Also, add pics
The only thing that comes to mind is that you planted it with the "tail" (radicle) facing upwards? Else I don't know. Cover it with soil to protect it.
What did you plant them into? Cup? Big pot?
There are plenty of things can cause early flowering. On top of that, it looks kind of pale
Tell us about her.
How often are you watering and how much? Thos pots look dry in the picture. If you insert your finger an inch and it's dry, you can water them again.
Are you feeding them something...
while it's true that sometimes you can get "mutants" I woulnd't swear by that before making sure they're dong ok.
Have you checked pH of run off?
Are you feeding them something? If so, what and how often?
What are you using for watering? Normal tap water? Are you leaving it in an open...
They're too little for all of that. Your soil probably has enough of what they need to grow and there's no need to add calmag or any feeding right now.
Just give them water when the soil has dried (put your finger in the soil to check) and give them enough light and warm. Check on them for a...