Ok,so you where right the snakes got to hot,a lot played into it and they where not controlled with a thermometer and the the outside temps where over a 100(39 celsius to be exact).
So i really have to say it was my own fault and i messed up.
to the other posts:

The 50 watt was on a lamp stand and like 4 inches away from the screen top.

Yes the baby corn got burned before on a UTH but i got her to the vet and all healed up nice and thats why one of them was heated by a lamp.

The mouse bite was no bite but a little scratch from the mouses foot.
And it was on a different snake.

to the not eating:
I kept two cornsnakes together for like 2 month but then decided to keep each one sperate.
after that he ate fine again there were no more eating problems.

My other 2 Snakes are fine btw and are now run by a zoo med rheostat.
(they are in a different room which doesn't get so much sunlight.)

I guess i learned the hard way and believe me i feel sad about it,so please don't see me as a bad person that doesn't take care of his pets.

So now flame away.