In bandstructure, you will find an option "Energy zero" selected at fermi level. It will shift all the bands by the fermi energy value. Suppose Ef = -0.4 eV, VBM is at -0.8 eV and CBM is at -0.2 eV, the fermi level shifts to 0. this means al the bands will be shifted by 0.4 eV upward. New VBM and CBM would be -0.4 eV and 0.2 eV. It is done because, the band energies are calculated relatively.
If you want absolute band energy without fermi level correction, just change energy zero to Absolute energy.