mold!

It should dry out before it molds.
Likely substrate, dry food, poop, or cricket parts are being introduced into it, and these are molding.
How often do you change it out, how much do you use at a time, and for how many crickets?
 
Use less, and change it more often maybe?
I used to use it, I use oranges now. MUCH easier/cheaper.
Just change the orange slice once a day.:)
 
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