Shadow issue

In my project, some foliages are not having shadows in one place. in the map, the directional light is dynamic(movable). If I change the light to static or stationary the shadows are coming. I need shadows in dynamic light only. 3 of the foliage are having shadows in the place, for the remaining foliage models shadow is not coming.
This is not a problem in the model, because I checked the same model in one another place, shadows are coming there.
If anyone has an idea what is the problem, please revert back.