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Hi, after adding the following keywords in INCAR file while keep everything else (POTCAR, POSCAR, KPOINTS) the same,

NSW = 50
IBRION = 2
ISIF = 4

the same DOS plot of the same system shows an extra spike/peak at -30 eV. There was no such peak before I add these lines. What could cause this to happen? Is it because the ion optimized outside of cell now? Please help.

Thanks in advance

When you have the same set of atoms you must have the same DOS. Perhaps you changed the interval of energies in DOS-evaluating procedure? Have a look at the character of the peak at -30 eV (using pDOS).