i try to calculate the bandgap of Unitcell and Supercell(2*2*1) of TbMnO3 in CASTEP but there is a difference in the band gap. like the bandgap of unitcell is 0.63 and bandgap of supercell was 0.58 but as far as i know the bandgap should not be change

there are some details.

Function = GGA-PBE

Pseodopotential = OTFG ultrasoft

cutoff energy = 437.4 eV

Spin polarized with DFT+U

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