Don't give up.

Good egg attached to two dead eggs - the dead eggs had maggots in them, the works - but the good egg continued to develop just fine while the bag eggs eventually hardened and shriveled up.
Someone (I think Nokturnal Tom) in the kingsnake forum posted a picture of a very nasty looking egg - pipping.
Anyway - my first snake clutch in years was laid last year.
12 good eggs.
a few weeks through, several were dead and more dying.
The problem was too much moisture in hatching medium. Humidity was right, but humidity guages don't measure the wetness of the hatching medium. I redid the setup and the eggs stopped dying.
So check what the eggs are sitting it - it may be too wet even if your air humidity is fine.
This year I'm using vermiculite - mixed with water 1:1 by weight. One clutch was a little dry and a couple eggs started to dent, adding damp moss caused them to pop back out. Other clutch hasn't needed that adjustment.
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3.6 L. getula californiae - 16 eggs (Cal. King)
1.1 L. getula nigrita (MBK)
1.0 Pantherophis guttatus guttatus (Corn)
0.1 Pituophis catenifer catenifer (Pacific gopher)
3.3 Elgaria multicarinata multicarinata - 14 eggs (Cal. Alligator Lizard)