What went wrong with my incubation?

[MrCurt]

I got six eggs off eBay to hatch and I only had two chicks hatch and one of those has a deformed beak, which it can’t open and therefore can’t feed. I made my incubator but I was meticulous with the whole process and I tested its performance prior to any eggs going in but this was the results:
Egg 1 - perfectly healthy chick hatched day 21
Egg 2 - pipped day 21 but hatched day 22 and can’t open beak
Egg 3 - died in shell, checked at day 24 and it was formed but just didn’t make it to the air sack
Egg 4 - died in shell, checked at day 24 and it was formed but had bloody in the sack with chick
Egg 5 - stopped developing at day 4/5
Egg 6 - not fertilised

It was manual turning and I was turning the eggs 5times a day. Obviously the incubator dropped temp/humidity every time I turned the eggs but it was very efficient and generally went back up to temp and humidity in less then one minute. It ran at 57% humidity up to day 18 and then humidity was 67% for the last few days/week.

what did I do wrong?

 

[ChickenCanoe]

Turning 5 times a day is a good thing. You probably didn't affect internal egg temperature by doing so.
You may have done nothing wrong. The one good chick hatching on day 21 indicates the temperature was good throughout.
The problem may have been the eggs. Shipped eggs always have lower hatch rates. You don't know for sure how old the eggs were when they were shipped, do you?
You couldn't control the nutrition of the breeder flock. Breeder nutrition can greatly affect hatchability.
Normally, a crossed beak is due to heredity.

 

[MrCurt]

Thanks for your response.