Getting only male roaches

cody5462

Ootheca
I'm currently breeding a feeder colony for my bearded dragons, and I've noticed an odd pattern. For a long while I was getting roughly 50/50 males and females. Over the last 2 months however, almost all of my nymphs have become males. I thought this was an odd luck, but two months is a long time to go with getting almost exclusively males. What might be causing this? 

 
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