I am dealing with the fitting of NaMn0.3Fe0.4Ni0.3O2 second shell.

I have Mn, Ni, and Fe at 2.9772Å and Na at 3.1859Å, showing only one shell. If I use any of the transition metals (dZ <5) for fitting the second coordination shell. fitting is fine, but when I introduce the Na path, the fitting has no sense, CN_Na grows and also its error.
Even including Na, I have Nvary = 10 and Ninp = 13.98, so I am getting out of ideas and nothing helpful in the ifeffit Archive until now.

Is there any strategy for dealing with mixed second coordination shells? I am attaching the file exported from Larch and the cif file.

Best regards.