Hey, in my experience, a seed getting stuck doesn't impact growth at all.
You may be dealing with a "hot" potting mix; meaning that your mix is high in nutrients.
This can lead to slow growth and nutrient burn; I believe that's what I'm seeing in the picture of day 9.
Another tell tale sign of a hot mix is when your young leaves are dark green in colour, although this can be associated with phenotype; I don't think this is the case for you.
What mix are you in?
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