i think you should pay attension to “Bias” parameter, because Eevee render engine does not use ray-tracing, so use “Bias” can avoid some shadow artifacts, but it also make shadow far away from mesh objects, i usually adjust the “bias” to 0.1(default value is 1), in “contact shadow” , bias value adjust to 0.01, certainly the “bias” value should adjust according to the mesh objects’ size.