I have a dimeric Copper system, where the two coppers exist as Cu(II) [d9]. However the system also has two radicals on it, which I am taking care of in my NELECT section of VASP along with NUPDOWN tag. After the optimization, the spin density on the system is mostly localised on the two radicals with no density lying on the two coppers. What can be a possible reason for this? Do I also need to change the NUPDOWN tag for this system, or the tag defines the spin multiplet of a metallic entity(Cu) only.