Connect the Metallic map directly to the Metallic slot.
Connect the normal map directly to the Normal slot.
In editor double click your Roughness map and un-check sRGB.
In material editor select the Roughness texture and on the left side put it’s mode on Linear Color.
Also when exporting your textures from substance painter try to save as .PNG and after export is done MAKE SURE to change your normal map from 16Bit to 8Bit before you import it in the editor.