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I was taking a CONTCAR ( not fullt relaxed but and intermediate structure) and using those coordinates, I was trying to look at the instantaneous energy with a static run. The energy values are not matching. Did anybody come across similar situation ever or Can anybody imagine a possible explanation? Thanks so much.

have the basis vectors changed (V- relaxation), or did you use a different number of nodes (NBANDS!), k-points (irreducible part of the BZ changed) or BZ integration algorithm (smearing)?