You should not be having to pull the seed shell off the seedlings, it should naturally discard if you do not rush it as the seedling is still developing underneath and needs to be protected from the light, as it grows and expands it will break out by itself. The protective sheath around the starter leaves also supply nutrients for the seedling to start to grow so don't be in too much of a hurry to pull this right off.
The only time I pull the seed shell off is when it is obviously stuck, and it needs a little encouragement to help it along.
Well, If left alone that looping tap-root breaking the surface would direct back down and prop up the sprout head
The times when i have seen it happen it isn't looping at all its just coming straight up out of the soil like a stem but with no leaves on it.