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Dry Kitty Litter in a set up tank

This is the first time I am using kitty litter as part of my substrate.
The tank is set up with 1,5" of kitty Litter (made from betonite clay) 
cover with 1" of fine sand. After filling out my tank, I notice is that 
the kitty Litter in contact with the sand has been expanded but the 
underneath clay remains dry!!! 

Is that normal ??