Normal for chickens to turn up their beaks at crushed oyster shells?

I have three feeders in my coop. A big regular feeder for Layena pellets, one small feeder with oyster shell, and another small feeder with grit. I check on the grit and oyster shell occasionally but they rarely need to be refilled. They feeders are wall mounted (homemade) and so they are not using much space.
 

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