Hi, very new to unreal here and having trouble with my lighting behaving very strangely. any help would be greatly appreciated 
This (looks like) shadow acne, if it is then there’s basically no way to fix it without using raytraced shadows.
For regular shadow maps you can bias the shadow further but then your shadows float away from your meshes (an artifact called “peter panning”) but none of these settings appear to do anything for virtual shadow maps.