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Unsupervised Classification runs on wrong number of classes?

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Hi,
So my problem is that I am running an unsupervised classification, and for some reason it is not running on the correct number of classes. If I try to run a 12 class classification, it returns only 10 classes. I have no idea why this is happening, as it runs correctly for a different set of data.

Code:

#Unsupervised Classification
    Classified= Divided
    Output_signature_file= "Scrap.gsg"
    outUnsupervised = IsoClusterUnsupervisedClassification(Filtered, 12, 20, 10, Output_signature_file)
    outUnsupervised.save(Classified)
    arcpy.AddMessage("Unsupervised classification complete.")

Advice?

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