This may have to do with the atom's multiplicity, see:
http://www.mail-archive.com/wien%40zeus.theochem.tuwien.ac.at/msg07956.html
Excerpts from Hosein Khani's message of 2014-10-02 17:13:45 -0400:
> After plotting DOS for orbitals totally and partially (for instance total
> d, dz2, dx2y2,...), it is always observed that the total DOS is not the sum
> of partial DOS! Could you please tell me the reason?
>
> Yours
> Hosein
--
Sincerely,
Oliver Albertini
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