What is wrong with my plants? Help please

I recently got some Purple Urkel plants and noticed they have some sort of problem with them and I am unsure exactly what that is and would appreciate some input. Some of the leaves are losing color and starting to curl and mutate (or something) yet other leaves on the plant are ok. Any ideas? thanks. They had this problem originally so i am not sure exactly how they were grown but most my clones have the same thing occuring. Its only on parts of some leaves also, it doesnt necessarily happen on the whole leaf but sometimes does. Thanks
 

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