How old are they? Is it hot where you are? Everyone still eating, drinking, and hanging with the group? Any signs of lethargy?
All urates pass in the dropping so heavy water intake can seem like diarrhea.
Funny enough coccidia are in every dropping, even when it isn't coccidiosis. The only way to know if you have something parasitic going on is get a fecal float done at the vet. What kind of wormer did you use? Did you see reason to use it?
It takes way more than 30% + protein to cause kidney issues. Calcium fed to non layers can also cause it, just in a different form. 16% protein in layer in the MINIMUM need to sustain a light bodied layer like leghorn in laying condition. I feed 20% protein flock raiser with only anout 1% calcium and oyster shell available on the side. Especially if you are being sure to give only non protein snack you may be diminishing protein too far. Dual purpose breed like Marans and Orpington will do best on NOT less than 18% protein. And one way or the other, come hell or high water... NEITHER high calcium or protein will cause birds issues if they are not somehow predisposed genetically AND fed an out of balance diet. Sometimes the really pretty organic feeds cause this issue by them being able to pick out only their favorite pieces like the corn. Again, 16% protein in layer is the minimum. I never aim for minimums... Though I'm not saying that's your issue... just saying don't buy what the fear mongers are selling! *Can* cause problems is not the same as will.
I stink at diagnosing dropping!
But I think
@casportpony might be our resident poo eggspert.
Hope all is actually well!