There is a "known problem" (known at least to Don Hamann, the creator of the ONCV), I will paste part of a conversation I had with him a few years ago pertaining to the same problem:
" The Fe SG15 input data must have been on the "hairy edge" of ghost behavior. A small change of the local potential in the input should make it go away with the corrected 3.3.1, although I have not tested this yet. It is unfortunate that some other SG15 input may have the same issue, and I'm confident that such a small local-potential change should not effect the quality of the psp, but the whole set apparently needs review. Deep ghost detection was an innovation with 3.3.0, although the SG15 automated input data refinement using real solid-state calculations would certainly have rejected data that produced ghosts with 2.2.1 " HTH! Chris -- Group Leader "Theory of Quantum Systems at Surfaces" IBS Center for Quantum Nanoscience Seoul, South Korea
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