Sounds like at least one is very stressed. Separate them all for now.

How old are these crested geckos? Males have very distinct hemepenial bulges and females do not, it is very easy to sex these geckos once they are 9 months old or older. There are other ways to do so before hand but not as accurate or easy.

img383.imageshack.us/img383/180/sexageadultesciliatusjg4.png

This pictures shows quite plainly how to sex crested geckos.
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PHLdyPayne