This is typical problem in i30 with full led. Short lights have autolevel, So they go down or up depedning on car load. Long lights are stable, no leveling. So if short lights go down, there is dark strip on road, because long lights shine to high. This is producent problem. U can manualy correct level of lights separetly. But u have remove mechanizm / gear from the aft side of lights. The mechanizm connects two thick screws to leveling lights. If u disassembly this mechanizm u can regulate short and long lights separetly. Then u can turn down long lights to reduce or remove dark strip on the road/Wall.