Anyone know what causes a seed (after germinating in a wet paper towel) to rise above the grow media, and stop developing. ie not force the seed shell open/off?

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i am currently germing 5 ams fems and 10 northern lights, the first nl to pop did this, the stem seemed healthy, but it wouldnt lose its helmet. gave it like three days, and mold started to grow on it, so i pulled it. dont have any clue what causes it though, first time ive seen it.

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Life.. by Marshall Mathers
What is life?
Life is like a big obstacle
put in front of your optical to slow you down
And everytime you think you gotten past it
it's gonna come back around and tackle you to the damn ground
What are friends?
Friends are people that you think are your friends
But they really your enemies, with secret indentities
and disguises, to hide they true colors
So just when you think you close enough to be brothers
they wanna come back and cut your throat when you ain't lookin
What is money?
Money is what makes a man act funny
Money is the root of all evil
Money'll make them same friends come back around
swearing that they was always down
What is life?
I'm tired of life.........

That's got my ass hyper
I pray that god answers, maybe I'll ask nicer

you can take the shell off to help it along!it just means its a little weak but that dont mean it wont grow into a strong and healthy female.

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i popped the shell off when i pulled mine and the cotylydons were a grayish brown color, def dont think it was gonna make it

__________________
Life.. by Marshall Mathers
What is life?
Life is like a big obstacle
put in front of your optical to slow you down
And everytime you think you gotten past it
it's gonna come back around and tackle you to the damn ground
What are friends?
Friends are people that you think are your friends
But they really your enemies, with secret indentities
and disguises, to hide they true colors
So just when you think you close enough to be brothers
they wanna come back and cut your throat when you ain't lookin
What is money?
Money is what makes a man act funny
Money is the root of all evil
Money'll make them same friends come back around
swearing that they was always down
What is life?
I'm tired of life.........

That's got my ass hyper
I pray that god answers, maybe I'll ask nicer

I pulled the shell off, and the cotyledons were still whitish. After a few days, they greened up a little bit, but never opened, more leaves were attempting to grow out of the sides, so i very carefully force opened it myself. One of the cotyledons seems dead, but the other is fine. New growth is starting, so its cool.