Its probably just because there is a slight difference in the way that the two name are spelled. For example, I have two categories for Mindless Self Indulgence because one is spelled Mindless Self-Indulgence and the o ther is spelled Mindless Self Indulgence. Go back into iTunes, highlight all the songs you have for that artists, right click ->get info-> change the name so you are sure they are all spelled the same.
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