Speed to the void 1.7.2

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
I was going to fly up high.
What actually happened was...:
Describe what happened here
Dearly night/day dimension
Watch the video I made. It is indescribable. https://m.youtube.com/watch?v=Qih1s4VUU9E
Steps to Reproduce:
1. Place down a ton of command blocks (about 1000)
2. Make them all summon primed TNT at the same place at the same time and stand where they are being summoned
3.