Red cherry shrimp question?

I'm having trouble breeding my shrimp - sort of. I have an equal balance of males and females, lots of molting. However, the females aren't keeping their eggs. Instead they're dropping them. I'll see bunches of eggs laying on the plants. What's up with this?

My parameters were tested and they were all A-OK. The temperature is about 82, which they don't seem to mind. The PH is around 7.0. What can I do to successfully breed these and what's causing them to drop their eggs? Is this abortion - shrimp style?? ;)