My suspicion is that conditions are a bit too dry. The only time I've observed something that looked somewhat like this was several years ago, when I was breeding Veiled. I had a large container housing a clutch of eggs (~50 or so) that hatched over a period of a few weeks. Normally the container was covered and only opened maybe every month or so. During hatching I was opening the container daily, and apparently more moisture escaped than I realized. Most of the clutch hatched without problems, but by the end of the hatching I had several young become trapped in shrunk, relatively dry egg shells, and perish. Sure enough, the incubation medium was, to the touch, much drier than normal, which I believe allowed drying of the eggs as the young were hatching, trapping them and leading to the demise of a few.
This may not be the problem in your case, but by the looks of those eggs I'm suspicious it could be. I might try carefully moistening the substrate a bit (e.g., misting it) to see if there is improvement.
cj
cj