Help please!! Can't save (gb, gbc and gba)

On my miyoo mini +, in some games like pokemon, zelda minish cap, etc.. (on the gba, but this also happens with gb and gbc games) when I save in the game then get out I lose all my progress and idk how to fix this I changed 5-6 games core and neither one of em allows save state, rn I'm using mGBA but still I can't progress games without losing progress, what should I do? Please help I can't play my games anymore it's been a week 😓