Larry this is strange.I to would recommend seeing a vet.If they were my cats i would first change there food and then get some bottled water to give them.Some places have a lot of chemicals in there water.
I don't know if you make there food or use commercial food but if you make it double check what you are putting in it.Commercial food you shouldn't have any proplem with it except getting them what they like.I give mine the commercial food he likes and never have a proplem.
For all four of them to have the same proplem sounds like a eating or drinking proplem.Give the Vet there diet.
Lou

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