Thats impossible for seedlings to be able to pop out of the soil in 4 days bro..I think u we're mistakin with the tails coming out of the seed while germinating, but mine usually pop out in 24 hours...But Thats besides the point
Did you plant tap root down? Heh, I've heard of people planting tap root up.. the plant will actually start to grow leaves and such under the soil level.